GvG is pretty broken as others have already pointed out... however PVP servers are still a great way to experience TERA.
On a PVP server I feel that while you are leveling as long as you have the patience to die once in a while (being ganked) or the cajones to fight back against some one outlawed at your level (yummy!) that in the end PVP servers are a far more rewarding experience than PVE. The other players themselves add additional content to the game. Whether it's PK or PKK or just accepting any challenge that comes your way PVP is the most exciting and fulfilling way to experience TERA. You don't lose anything other than time for losing to an outlaw. I almost feel that PVE servers are not experiencing all of TERA because with combat this fun each PVP player is a whole new mob to fight... poor PVE guys. Really EME why so many PVE servers? o.O
Every once in a while I understand that you just want to be left alone to PVE. Hop to a lower channel on a PVP server and you'll be fine. I swear I've only ever been involved in PVP in the first couple channels available. It's like a unspoken agreement. On channel 1 - you're going to PVP, channel 2 - PVP possible, channel 3 - PVP rare, channel 4+ - PVE hero time!!!(*â‰§â–½â‰¦)
If my opinion is not obvious already (If my opinion matters) I say go for a PVP server. It's too much fun to fight others in this game to be restrained to PVE. It's also very easy to avoid PVP if you are not in the mood to fight thanks to the channels.
P.S. - come to Valley of Titans!