Wow...there are a lot of Runescape fans here, I love it too (I cant wait for summoning) but people tell me I should play a "real" MMO.
Its hard to pick a favourite game as we have a lot.
I like RPGS, so maybe the FF series (but i'm not a scary fangirl!) or something similar.
But if I had to pick my favourite game that I've played this year I think it'd be Super Paper Mario... but by the time I've actually posted this reply I'll probably have thought of another!