I understand that this site already has reviews of everything, and it's in constant discussion, but I just felt like chiming in and saying some things about some of the sites I've played on.
The good :
PokerStars : I've never been too big of a fan of their cash games as there are plenty of good players there. I've really hated what limit has become with no one respecting any kind of bets at all. But this is my favorite place to play with regards to tournaments and SNGs. Best structure and plenty of good competition, yet still plenty of idiots too.
UltimateBet : Probably my next favorite place because they have the best mix of cash games and tournaments, especially for Omaha, where there are always good games going at all hours. SNG's I have mixed feelings about because they are slow to load it seems, and I haven't really done well in the multi table SNGS either. Tournaments are alright, but would like it a lot better if they had more Omaha tourneys like
PokerStars.
OK:
Full Tilt - I haven't played a whole lot, I did well in a tournament that seemed to have a really weak field compared to what I play on Stars and UB, but they really don't offer a lot in the cash games, especially with Omaha which all the tables are empty pretty much. I'm really mixed on this site, still plenty of idiots (as witnessed in my limited experience with cash games and SNGs), but plenty of good players as well.
PartyPoker : I refuse to play any SNGs or tournaments at this site. Great cash game site with plenty of morons to cash in/sucked out on. I really have mixed feelings, I was able to make some money off it when I played some 3/6 and 5/10, but I didn't really enjoy playing on it.
The bad :
Pacific : Same old song and dance, it just sucks, plain and simple. I did have one great weekend on there where I dominated some mid-limit SNG's and wound up 400 ahead and other than that I hate the site with a passion. Just the word
PacificPoker makes my blood boil