As a warrior on COil, turn 1, I can say this.

1, any content a paladin can tank, a warrior will be able to do. What that means is, where ever a paladin can go a warrior can go. The are warriors on turn 4 of coil and survive just fine.

2. Warriors WILL unfornately put more stress on a healer. This does NOT matter though until Titan HM and beyond where it becomes painfully obvious. I had a experience as a war tank on titan hm, where I made it to 10-5% of titan hm as a Main tank. What ended up killing me was the healers began wiping because they had to focus more on healing me and less on their own survival. The very same healers one shot Titan hm when a paladin tank came to tank, with me as the off tank. The paladin while he did take loads of damage, his health never did drop below 70%. My health on the other hand always droped to somewhere around 30 and some times 20% and maybe a inner beast would off set that by 10% if that.