Exactly, Kat and I have finished Caledon and Queensdale + story to 16 and we are 20-21. You get a lot of xp from completing the zone and some good completion loot. Mind you, you get "level appropriate" items so it could be worthwhile to not complete the zone tile later.
With my WvW-centric "im bored" warrior, I am 17. Done about half of Queensdale while waiting for queues, but most all of my real xp has been from defending. Crystal Desert has only lost once so far that I have seen and that was to Ruin/The Towelliee Zergfest of Northern Shiverpeaks. So if you want a non zerg/wvw-centric server that does well, come on over. Send a message to niwaar.5631, katlan.6301, reignald.3794, or chasiubao.3791 for a guild invite.
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