Runes of Magic is awful. They've tried to blatantly copy the WoW style of graphics and gameplay, but with none of the talent or soul of WoW's design. You're also constantly bombarded to buy stuff from the shop, it completely breaks the immersion.
Guild wars as someone always points out in these threads, is 100% instanced. Good game, but only with a regular group of friends.
You could try out the US version of dungeons and dragons online, that recently went ftp with an optional sub. There are some pretty severe limits with the free version though, and again you get bombarded to either buy stuff or take out a sub.
If you can stretch to it, you can pick up lord of the rings for about €8, and 60 day game time cards cost €15, which is silly cheap for such a quality mmo.