I have been playing guild wars for a few weeks now and quite enjoy it. I dont feel the looming pressure to play it cuz there is no monthly fee, the quests are not based purly on loot and killing mobs. Its not a huge time sink and getting a group to go questing is done in a matter of minutes, not hours and hours of "lv 20 Elementalist LFG!"
The entire game is based completing quests and missions, not on mobs kills for experience points (XP), for many mobs give very little XP, some zero, but at the end of a long mission you can get 500-4000 XP.
This is deffinetly not an MMOrpg, the community aspect of the game feels quite lacking really. Each town/outpost is really nothing more then an ingame "waiting room" where you can chat, buy/sell/trade your wares and found loot during your adventures on missions.
Currently im about to do the final mission in Hell's Precipice (Ring of Fire) and i have to say that it was one heck of a storyline so far.
All in all i still really like this game. For those of you who liked Diablo 1 and 2, that like a good hack n slasher with a very decent story/quest driven system, should really try this one out.