I strongly suggest priest, at least its not boring like paladins, though paladins kill stuff much easier than priests do.
And they did ignore many old tier sets.. warrior t2.5 has rage cost reduction for shouts, hell yeah. But - if you roll priest - t2 5pc gives you 50% chance to fade when hit in melee, which is pretty insane for shadow (it seems to work with that talent that removes slows when fading).
And yes blizzard did screw up lower levels badly and doesn't seem to care. Just look at frost mages. Its both the screwed up availability of key abilities and tiny health pools hugely favoring burst classes.