It's always hard to predict what another person might enjoy but so far MoP has shaped out to be a pretty solid expansion. The raiding is intense and complex, there are many laid back side activities, a lot of treasure hunting/exploring if you're into that kind of stuff and some pretty hardcore things like Challenge Modes, Proving Grounds and (because it can be outgeared) to a lesser degree the Brawlers Guild.
I'd say just give it a try. And to avoid the 'desolate server' problem, just pick one that is populated.
I wouldn't rely on Blizzards advertisement which server is full and which is empty, but instead look on WoWProgress or some similar site.
Edit: I think they hinted at a possible patch 5.5 that would (obviously) come before 6.0 and adress the changes to Orgrimmar that happened during and after the siege. Edited, Oct 10th 2013 6:53am by TherealLogros