Why is everyone only looking at 1 v 1 scenarios? Bgs and arenas are team fights, and warriors are there to spread damage and execute enemies when they're low on health. That's just how warriors are in this expansion. Rend is ridiculous, and use it while it's still here.
You do realise that when a warrior and let's say....a priest/shaman whatever fight classes that can heal (say ret pally/enhance/druid) back to back, they're at a severe disadvantage? The other two that can off heal can easily support each other back to back while the warrior is unable to heal their partner. Therefore, the two off healers could target the only healer and decimate him, leaving the warrior "left 4 dead."
I'm not trying to say that classes that can't heal are bad in this bracket.
Alright, let's see.
Hunter- extreme cc, good interrupts and above average damage. While they cannot heal, they can easily escape and los.
Rogue- stealth, high burst damage with interrupt lockout. Survivability not as good as hunters but they make up for that due to their surprise and they can re stealth.
3v3 the warrior does better but still not great.
Battlegrounds, while they do not pop as frequent have 1v1 as a pretty big part of their structure. Especially when you don't have a good/cooperate team, you could be the lone FC trying to save the day and get ambushed by *insert class*.
Or you could be that guard at GM that instead of engaging the lone inc enemy, you are forced to run away, or die. Unless you are amazingly good or the enemy is under geared/bad, you're gonna lose.
True, rend is good, but unless it's used on a non healing class, it's merely an annoyance 80% of the time and could be easily healed. Slam, on the other hand dealt a ton of damage in a short amount of time, putting way more pressure on the enemy.
Nerfing warriors in any shape or form will utterly destroy the class.
They don't have survivability.
They don't have lockouts.
They have some cc; a slow costing rage and charge interrupt.
They do mediocre damage, but rend is not as useful as some may think. By nerfing their damage, you are destroying the only thing they can do.