I don't play as regularly as I used to, but since bitcoin poker site still don't have a lot of players, I usually make a few games on pokerstars. It's easy to find a game anytime I want, and it's reliable, or at least I never had any problems with them.
Bitcoin poker does have a lot of positive sides to it. However I certainly agree, player liquidity is certainly lower.
Mostly I play poker on casinos but because of my busy days I tried to play online, and pokerstars is just a good place for me to play. Yes, liquidity is a big thing so if you choose gambling sites always know their rules about withdrawing.
Yes certainly, some sites might have minimal withdraws that might be high depending on your bankroll.