I used to play it(quite a lot, I admit. I was lvl 92 when I walked away forever.), but I just stopped playing it for a few days, and when I considered going back I suddenly realized how soulless a lot of it is. It has a few interesting quests that are occasionally slightly amusing, but apart from that it uses the Skinner Box (see the Extra Credits vid) much more than even a lot of other MMOs to keep players hooked. It isn't fun; you just keep waiting and waiting, grinding and grinding, telling yourself: "just a couple more levels and this game will become awesome..."
...but it doesn't.
Forsake runescape! Cast off your self-imposed chains! Be FREE!