Good MMO's are usually the ones that require P2P. Warcraft's a good example, though it is notorious for it's 'fuck-up-your-life' thing. I don't play it myself, but I've heard good things about it from crazy PC gamers.
its that funny one, no big one, no small one.. seriously i wont recommend such games cus i want no part in the thing that will possibly ruin your life.
maplestory for cuteness la tale is maplestory-like with combo attacks now im playing dragonica which is like 3d version of maplestory and latale i got bored from them so i stopped. i play gunz online here and there to pass time. gunz isnt really a lvl based game. its more of a skill and knowledge based. its a 3rd person shooting with swords very very similar to devil may cry. in fact they have similar maps.
Fairyland Online for a cute RPG with a final fantasy turn base combat style Emil Chronicles Online another cute mmorpg Project Torque for a Racing game Drift City a racing mmo CTracer another mmo racing game but low requirements contains Initial D maps for the downhill racing mode.