I've made several good cashouts from Rivals, but not lately, I agree with oldtrvlagt, it all or nothing.
I've had some unbelievable good runs last summer, but October and especially November were a nightmare, with no cashouts at all and hardly any decent wins.
I agree with you that some of the slots have terrible paytables, I tend to avoid these, as they never seem to pay and I always wonder how on earth these slots can reach their RTP percentage.
Secret Garden for example, holy christ on a blue bike, how can you possibly WIN anything on that crapslot?
The line payouts are even worse than Scar Rich 2, no expanding wilds or wild multipliers, freespins only have a 2x multiplier and scatters don't pay.
Gave it another try yesterday at Tropica, got 60 free spins due to retriggers for a total of 17x bet!
Looking at the paytable this slot is very high variance, but I really wonder where the good side of the variance is, must be that bonusround..
Compare it with one of my favourites, So 80's, now THAT slot has a decent paytable, wilds give a 3x multiplier when completing a win, scatters pay as they should pay and 3 of them trigger 15 free spins with another 3x multiplier!
Maybe one day I'll find out how you can win anything on Secret Garden, Fantasy Fortune and Hobo's Hoard..until then, I'll stick to my favourites.