I'm restricted to US sites, and my experience has only been with RTG software at Bodog and a couple of the Mainstreet Group sites (Las Vegas USA and Sun Palace).
I can give you my experience but no supporting data, but I can tell you the next time I play I'm capturing a spreadsheet of results.
The main thing to consider about my experience with all sites is that I played over 24hours with very short breaks during each play session, and you can only take my word for it as a long time data analyst that I tend to retain trends and patterns.
Oh, and I've played 100s if not well over 1k hands at local casinos.
IMO Bodog appeared to have what I would consider expected BJ play that I've experienced at a B&M casino. I burned through about 14k of wagering requirements playing two hands all the time, and they were only giving me $.50 on the dollar for BJ toward my WR.
Las Vegas USA and Sun Palace played exactly the same, and I hated them. The only reason I actually ran met my WR with the first one starting at $225 and ran it up to $570 is because after hours of play (one hand game) I actually picked up on a pattern. It wasn't 100% predictable but it was close enough that I could grind out a profit every time I played. I say this because after meeting the WR, I then played around with some games I had always wanted to try, lost a little money and went back to BJ to get it back. I busted on Sun Palace due to just burn out and pissed off because the BJ was the same and it was getting on my nerves so I went on tilt and threw my betting and bank roll strategy out the window.
Here is what I seen and why it was such a pain in the ass and boring to play:
I played tailor made BJ strategy from what I knew about the rules of the table as well as toying around with different betting strategies.
Losing mode! All I had to do was watch for the obvious in most cases and that would be two consecutive Aces up for the dealer. I would then drop my bets to the min of $1. I also would look for things like the dealer hitting two quick BJs or a consectutive BJ then 21. Basically every time I seen certain cards for the dealer and myself I dropped to $1 bet and sure enough I would just click as fast as I could to burn through what I called the losing mode. Usually lasted between 12 - 15 hands in a row. I guarantee you could not win. The dealer would usually get 20-21 or a BJ and always had a 10 pt card showing so even if dealer didn't have those values you were always getting 12 - 16. So you hit and always bust. As for double downs? It got to the point where I laughed when strategy was to double down. I usually just didn't because I was tired of getting 5 or lower. I've NEVER lost so many double downs playing at a B&M casino. Now there was an exception and that is when I seen the queues and based on the string of losing hands that I knew it was time for me to try to cash in on about 4 - 6 hands that would win. Not in a row mind you but like I said, the cards between me and the dealer would take a very distinct turn, and that's when I pounced. The only way to build my stack was to pick a hand I was pretty sure was in the win mode and I would bet $25, if that lost I gave it one more try at $50 and usually would hit it. Sometimes I had to go up to $75. At one point I was about 50% at grinding low bets to get +$25, then I waited and picked my hand to bet $25. If I won, great, if I lost, back to grinding. Oh, and after about 500 hands I had to make adjustments to the good BJ strategy. I figured out that during the losing mode if I didn't hit on 12-16 about 50% of the time I should, then I would sometimes get the dealer to bust. I rarely doubled down when I should unless I just felt like giving it a shot once in awhile. Basically I had my own form of the strategy based on the trends and patterns and found there were a few more WINS around the fringe of the winning hands if I did the unexpected.
It was a very tiresome dance, and I would say around the last 6 hours of play the game had actually changed a little like it busted up my WIN hands so they were harder to spot. Thats when I stopped because it was getting waaay too hard to make gains. I was still gaining but the effort wasn't worth the small gains.
Now Bodog was much more natural. I played it using good BJ strategy for play and betting and seen a typical variance I seen in more than one casino. No surprises and not nearly as tiresome to play. Bodog is RTG, but I've seen somewhere that it's a RTG version for Bodog. Sorry too tired to look it up again.
Mainstreet has 4-5 casinos that all offer the same first deposit bonus of 125% on $100 so you start with $225. US is so limited but after getting on tilt at the 2nd mainstreet casino and busting, I'm currently trying to find any good US site not affliated with them that offers a good starting bonus and allows BJ for the WR. Allowing BJ for the WR cuts down the options further and my overally bank roll is too limited to experiment too much.
If you are not US and can get on the playtech sites, I've heard really good things about that software on various BJ websites.
Really the only way you can tell if you're getting a good game is too have done a lot of research on the game itself, and have played 1000s of hands on trusted practice software or in a B&M casino. I've played in B&M with continous shuffle, shoe with auto shuffle, 4 deck, 6 deck, 8 deck
(what the dealer said), and I've had the opportunity and privilge to played at a hand shuffled 2 deck table. <--- Loved it, even though you were not suppose to show your cards and they would warn you if you did. So counting was not much help, but good strategy = win that night.
Oh, and don't assume results with play money at an online casino will be an indication of what to expect when you play with your deposit. I only use the play money mode to see if I like the software, and whether they offer multiple hands. Example: mainstreet casinos only offer single hand while Bodog is two hands, and bodog offered 2 deck and single deck games with higher minimums. I haven't tried those yet, but I would assume even with the deck getting shuffled every hand that you should see a better game from a single deck. At a min bet of $25 a hand I need a bigger BR on that site before I test it out.
My last bit of wisdom for you is do your research like you're doing now, bet small for at least 500 hands to see if you think something is fishy, and if you find a good game for you stop playing at a maximum of double your stack. I don't have quantitative data to show but I've always found things seem to start to go south especially if you double your chip stack. Stop and come back the next day. 100% increase is good, why risk it. Anyway, works for me. I always seem to go on a losing streak if I reach my double up limit and get greedy and keep playing for just a little more. Maybe I change my game or something, I don't know. I know I would have a lot more money if I always followed that rule.