OK, I would try the following:
Dofus - 2d cartoon graphics, but it has a great layout and design, mostly people are friendly
, and the max level you can be is 200. You can also have 5 characters on an account such as a rogue, warrior, archer, protector, mage, and many more. It's a great game, try it, I'm serious. The download is 357MB though, but it's worth it, trust me.
Jerrath - 2d somewhat classical graphics, friendly players, not so easy to level up but its OK, not many players (I went on Jerrath today and it was me and 8 other players online!!)
, and it doesn't lag at all, and the download is, I think, like 18MB.
HINT: When you start Jerrath there will be a Newbie Island, just go in front of the cabin, talk in Default, and say /finishtraining. This will take you out of Newbie Island, sort of a cheat.
Zezenia - 2d game, somewhat RuneScape classic graphics but a little better, kind of hard to level up, but it's a great game for a lot of people. Small download around... maybe... 10MB.
