Heres a breakdown of the big contenders:
1. WoW - Good fast leveling and excellent as a boredom breaker. Its main problem is that the good stuff comes at lvl 60, but you have to be in a decent guild to be able to do half the stuff at lvl 60.
2. Lineage2 - Aside from the grind (Powerleveling companies want $1300 and 50 days of 24 hour playing to get you to lvl 75 (max level), youve got the fact 1/2 your server population are gold farmers who KoS everyone else who plays in the same area as them. Lineage2 will end when the gold farmers force everyone to leave and the game as well as the farming business collapse on themselves.
3.Final Fantasy 11, from what ive been told everyone is forced onto the sme servers, on which the japaneese have had a head start and basically control the entire economy of the game. If u wish to take a break from the game (and stop paying) your characters are lost. *This seems like square are trying to suck money out of everyone pockets, in a sick and twisted way*
4. Saga of Ryzom - A game i played for quite a while, the graphics are brilliant, the storyline is second to none. The game offers Alternatives to just fighting. Wth careers as crafters and harvesters being completely viable. basically there are 4 "skill sets" Melee, Magic, Crafting, Harvesting. Each one has a maximum skill level of 300, and if you played hard enough you could get them all to Max level. You can edit spells within limits (eg Reduce casting time, at the expense of an increased mana cost). However last time i checked there was no PvP on the game. (please check the site if u liked what u read becuase my info was about 1/10 of the amount of amazing stuff they have. *note: i stopped playing cos i didnt know anyone else who played.
Auto Assault - 100% pure Awesomeness. Aside form the Amazing graphics, brilliant gameplay and fast paced action, they have a development team that actually gives a ****. The game was postponed for 6 months so that the team could impletement tons of changes requested by players, which resulted in a real overhaul of the game. Every time i patched during beta, the patchnotes would contain fixes to problems i remember reading in the forums, and ideas ive seen people posting about. Shame its still in beta though!