Dont see many people talking about Stone Armor so wanted to throw in a bit about it. I generally would play brutes if I was melee, and my power combos were all over the place, but for tanks Stone Armor was my favorite. Once I finally got my groove I never made another tank. I also played it only on large teams, and only when a tank is what was needed, he was designed to pull aggro and survive without aid.
Disadvantages: Multiple powers would slow you down in both speed and recharge. The only travel power you could use without dropping all toggles was teleport, and you would instantly fall if you did it through the air.
Advantages: Granite armor would almost cap resistance with just IOs of anything but psionics AND give you a good amount of defense. Recharge debuffs can be overcome with sets+hasten, and with my style of running Granite+Tough+Weave+Maneuvers then sit there doing nothing but taunt or aoe attacks slotted for taunt I was untouchable, and so was the team. I didnt do damage, that was not my goal. I was there to tank, and tank I did.
Also worth mentioning, Granite Armor increases your character model to a size larger than you normally can be, INCLUDING weapons. My character was as tiny as possible with the mace attack set, and it was always funny to turn into the giant form and look down on people around me, pulling out a giant hammer. I was going to remake him with titan weapons instead, but never got around to it.