Might try DDO, if you are like me, and cant stand the crappy gameplay, its all youve got, hellgate london and tabula rasa had refreshing gameplay, but apparently having to play a real game was too fucking much, because they both died
DDO has ALOT of problems, but its worth it if you play right, its got action combat, is based on the 3.5 ruleset of pnp d&d, and there is an attempt to cut out griding by making ALL xp gaining done through instances, so monsters dont give you crap, but completing part of the story gives you xp, and each instance has like, 4 to 5 difficulty modes.
the problems being that the xp earned goes down significantly the more you play an instance, the REQUIREMENT to play in a party of a large group of people to get any decent xp, uninteresting and uninspired designs of both armor and environment, lack of paladin mounts, lack of large exploration areas, huge difficulty curves for solo and small groupings, most people pay to play, so finding groups to play the free quests on gets harder to do the higher the level, and the worse of all: paladins are nerfed to hell and back
my advice: play this game for at least a week, and no matter what class you choose, make it custom, and if you are non magic give yourself an absurd amount of strength, no matter WHAT, ALWAYS put your skill points into strength, and if you are magic, give yourself decent strength, and magic.
other option: phantasy star online blue burst, there is a free semi-official server (google the game name) but it has a low amount of players, and like monster hunter, only 4 people in a party
also be on the lookout for global agenda, a game so good its got "failure" written on its forehead