I checked out several servers after the merge, not including Zek.
Commonalities;
Populations seem to be more or less equal. Typical evenings ranging from 175 to 215 toons in PoK any given night, on every server i checked.
All servers have alot of Ex-Zek gamers who seemed shocked at the generousity found in a Blue server. Their return generousity was most welcome (I still think they are all plotting my demise though) and have provided a new flare for dueling that seemed near extinct last year.
More GM events
Newbie zones are way over-camped, which has resulted in some rumor about there is no such thing as a camp or KS'ing. (Again, thanks Zek gamers for your generousity in reminding the noobs why KS'ing can be UGLY!)
My 2cp (Mostly a complaint, sorry) I thought the servers were all too crowded before the merge. I like the slow exploration that once might have been found on Povar. It saddens me to hear everyone so ecstatic about having no trouble finding a group, simply because i know the default method of how they want to level-level-level-level to 70 and forget the game, there's raids and epics to do!! Not typical of everyone, so if it doesn't apply, just /ignore last.
The flourish of everyone wanting to start a new guild, on top of more big raid guilds on one server, led to lots of disestablishmentarianism.
Bazaar has gone to the birds as i have noticed a huge increase in the multi-boxing auctioneers that spam their own prices up, as well as increased snot-nosed kiddy comments "If you don't like my price don't buy it, somebody will" But overall alot more gear is available.
MGB's gallore, never saw a MGB temp until after the merge, kudos on density mass there.
I ended up sticking with Maelin. I have to say the Vazaelle folks are much nicer on the average, made a few new friends from it. But it is much harder hard to find an open camp until maybe 3am. It's a pain to wait in line for an epic drop now. I have daily issues with people KS'ing me, which i take with a grain of salt and a laugh. Enchanter's have for the first time, mezzed a PH my group was camping, and kept it as a pet for over an hour in hopes we would leave so they could take the camp. I never saw so many level 65+ farming in level 20 zones, but then again, i never had so many level 65+ willing to help out a noob alt toon. I still think it's aweful, and that there should be an instanced PoK instead of PoT with this next expansion. That would make me smile to see the collective crumble into more clandestine pockets of society, resulting in a better roleplay environment, which the oversized merge populations has definately delt the fatal blow to.
Final Note: the roleplay server has always been a joke. Just a place to twink the gear you can't twink otherwise. Oh yeah, and since when did elven become the common tongue? I hate elves, they're worse than roaches... With that in mind, with more people, more items in bazaar, more twinking, more PL and raid farming, what destiny stands before us?
Now go away before i taunt you a second time!