Can we sticky this answer or something? It seems like we answer this every third day or so. No offense, OP, it just gets tedious.
As far as my opinion, you should follow your opinion. All the tanking classes are very even right now - save for one fight. What makes you enjoy the game? Follow that path.
Concerning buffs and miscellaneous stuff, each class has its buffs. Sure, a paladin may have his blessings, but a warrior can give everyone Commanding Shout, can Thunderclap & Devastate mobs. They all have something worthwhile to add to a group. And as this is a MMO - MASSIVE multiplayer - there will be someone out there to provide the buffs if you choose something different than paladin. I promise.
"Feel the fury of the mountain!" ~ King Magni Bronzebeard, Lord of Ironforge