The Brewmaster class is a very unique tank; instead of playing around big damage reduction cooldowns or self-healing, you delay all the damage you take with Stagger. Because of that, your biggest strength is that you can deal with large damage intake, only taking a small initial hit and then distributing the rest into lots of ticking damage. This is easier to heal than the big hits and spiky health that you would experience on a Vengeance Demon Hunter. You also have a good deal of mobility and bring Mystic Touch to the raid.
Your weakness is a higher/longer dependency on the healers keeping you alive.