i play an MMORPG called Perfect World International. go ahead, its free.
http://pwi.perfectworld.com/
it has 3 different races and a class system most like DiabloII
Human-- Archer, Blademaster
Untamed-- Barb, Venomancer
Winged Elves-- Cleric, Wizard
also there is an expansion to be release soon that brings in a new race, the Tideborn and 2 new classes, an assassin and Psychic.
there are 3 major cities for each of the races in the world with a 4th capital city for many higher level players.
plenty of soloing to be done early on but once at level 20 dungeons and quests open up that you need a squad for.
so far the level cap has been at 105, but the game is continually developed and level caps move up as more higher level quests are added.