I should probably not mention anything about Ret or Paladins because I always get flamed but....
The Paladin in general has no real flavor. Before in BC when I was Prot, we had reflective damage. In Wrath I still kept some of the reflective damage and Ret got Divine Storm. Although the original design was great for what the class stands for, the physical portion it was for the rest of the expansion was okay too.
The Paladin has always been a:
Melee/ healer
Judge of the condemned
Guardian
Stoic and devout warrior
The Paladin now feels like a test dummy really. The Tank abilities are nearly the same for the other tank classes, but as warriors of the light I would've liked to get more reactive ones. Ret paladins, while playing a warrior of the light as well, feels like an RNG based class with no real design other than to deal damage when procs happen.
I'm hearing the fun people are having from playing warriors and DK's. They are also hybrids and have more options to play with than Paladins do. My Paladin while leveling as Ret just felt totally empty. There just seemed to be no reason to level all the way through when I could go into the tank aspect and do better.