Verified answer

Runescape

MMOs are not for you if you just want to level fast. It's a major part of the gameplay.

If you are very experienced at any game, you will level much more quickly. Just stick with one.

P.S. Save up some dollars and get WoW ;p

World of Warcraft. Blizz has constantly nerfed the experience needed to level, so it's easier than ever. While I don't exactly agree with that course of action, it is what it is.