Welcome, Taiisien!
I played WoW and Guild Wars, and I totally agree with you regarding GW's excessive use of instancing - it's just not good enough. I guess if you're a hardcore PvP'er it might be a fun game, but even then I'm not sure.
I also hated the lack of information given to you by the interface - perhaps it's better now, but I'm all about playing ES3:Morrowind right now, so I can't be bothered to check, haha.
Once again, welcome.