Reroll Paladin. Warriors are just simply not AoE tanks, specially in raids. Best you can do is hope you have the right CD when you need it and try to manage. Shockwave/TC whenever possible.
I don't even try to AoE tank tho, let your Pally/DK friend tank the trash. Pick up one or two mobs to help mitigate his damage and I generally look for any stranglers that may be going to rape some clothies.