I have played at Party, UB and Stars. Stars and Party have equal numbers of good and bad players, but I notice the terrible plays being rewarded far more often on Stars. I played there for 7 months and will not be returning, though I did win two MTT's during my stay, I have to say that both times I was rewarded for bad decisions. I won't get into the rigging debate but I will say that I, personally, believe that something about this site is not on the level. I would highly recommend Party (just as many fish, but they are rewarded far less often in my experience) or Ultimate Bet (MTT's are even better than the overrated ones on Stars) but would not recommend PokerStars in any circumstance.