I've played a lot of MMORPG's , specifically pvp'd in them. And while i wouldn't consider guild wars to have the most fun pvp going for it, i will mention one area they strive in.
Dumping the hard holy trinity means that the number of hard-counters to every build is substantially reduced. In nearly every other MMO i've played there are many cases where i'm presented with an impossible 1v1 situation just because the kit i brought was hard countered- meaning the other player could virtually roll their head across the keyboard and probably win against me.
Some people like that, particularly those who aren't competitive and just want to be able to win sometimes, i get that. But it's not good game design, because that would be like playing a game of chess where the other player starts out with 6 queens to your 1, why would you ever want to play a game like that?
I have yet to find an MMO that holds up to the individual skill level of guild wars 2, which, ill be honest, im not very good at. And it is very frustrating to realize that i'm not very good when presented a fair, highly skill based scenario i have yet to have practice in.
Its not perfect, because if it were, it wouldn't be so imperative to extensively research a viable kit. That's the only step that makes this compliment true. The game developers should, as a courtesy to everyone, define the preset's by which pvp is most effective so that the general population isn't confused and hopeless to their own failures. But to those builds which actually make sense, generally speaking, everyone stands a chance. There's very, very rare situations where you'd encounter another player who's kit counter's you so hard where you'd be inclined to just kill yourself and save yourself the effort of trying.