Yeah, i would agree with you, RuneScape is an insane game, first when i played it i wasnt sure coming away from diablo 2, because of the look of it, but once i got into it i really liked it because there is so much more you can do. There is more things you can train for, i find in that game i am never board. Call me Crasy but i rather that game over WOW.
It isn't a bad game i have played it for a while but it gets boring. The graphics are a bit cheesy plus most of the game isn't written in proper english. I have found it to be buggy but otherwise it's ok for a free game. If you're looking for free rpg games you are pretty much out of luck if you want a quality game. If however you're looking for good free shooter games there are plenty.