Unlike what many people here claim: GW is past it's prime, definatly.
It's still a REALLY good game, tough, and the storyline of all 3 games (4 really) feels like one big well-written movie. So gameplay/storyline you should be OK.
Forming PUG'S (groups as you say) hasn't been mainstream for a long time. All people do now a days is simply grab heroes/henchies, and maybe a good friend once in a while.
It is also safe to say that GW is more of an RPG than a MMORPG, in PvE anyways...
So it really depends what you're looking for. Too put everything on a nice line for you:
If you enjoy strolling through a Storyline, killing all kinds of stuff along the way, completing some fun quests, GW is your game for you. That's it tough, nothing more. GW has no end-game PvE-content what-so-ever, aside from the grinding for your titles.
Don't let people fool you tough, alot of PvE'ers on these forums would like you to believe there is no grind in GW, but in reality, once you've completed the main storyline, there is NOTHING LEFT BUT GRIND.
If you enjoy a game that will last for a long time, in which you can work towards your character progression and watch it, and your friend's, evolve along the way, stick with WoW. WoW definatly is more fun once you've reached the upper-levels/end-game...
PvP in GW is not really worth talking about. There is some massive PvP, and some Random PvP, but for the High-End PvP you've pretty much missed the train.
Is it worth spending 100+$ on a game thay you'll play for 1-2 months, and then grow tired of? (As you stated, you're sick of the grind, so if you play casual, you should complete all GW campaigns in about 1-2 months)
That's your call
