If warrior gets some cards for value lategame, I do think this is a decent card. The problem with control warrior isn't removal but a lack of "op" end game like warlock dk.
This guy gets it. If Warrior can reasonably fight control decks in the late game than this card sees guaranteed play to shore up the aggro matchup. Also this card compares VERY favorably to Call To Arms which is poised to be THE meta-defining aggro card of the next rotation. Revenge saw play in CW and I believe this card on balance to be superior to that so if there is a viable CW that isn't odds only, this sees play.
Some of you are already off to a great start by calling this something other than great. 2 mana whirlwind, 4 mana volcanic potion (with 2 different hits to break through some deathrattles), 6 mana excavated evil (with even more potential to break deathrattles), 8 mana flamestrike (even more deathrattle killing), 10 mana for a lot of AOE. All of these seem inefficient (which they are), but the flexibility really makes up for the lack of efficiency allowing you to spend only the mana you need and not force you to overkill something. This card also combines well with a number of other warrior tools and can be a situational MVP for control warrior.
It's clear that Defile is a better card. But the advantage of Warpath over defile is that you do not need a chain of dying minions.
In a vacuum warpath seems too expensive to me (akolyte + warpath is 5 mana draw 1 card), but there are so many things that can happen (synergies, lack of other removal, etc.) that I voted playable.
The strength of this card, is utility. Yes, Acolyte of Pain + Warpath is on the expensive side for instance, but this is an AoE for everything between 2 and 10 mana, depending on what you need. And you can, as opposed to the forbidden cards, control both the mana cost and play order at your whim.
I'm pretty damn sure that this is a very strong card for warrior.
If Even Warrior is a thing (or just normal fatigue deadman hand shenanigans), this would be the end of many Aggro deck especially Paladin in general. Paladin for example tries to fill the board with murloc and dude and most of Paladin's minions don't have more than 3 health. It's very likely that you can clear their whole board with just this card alone. It also play around divine shield very well. This also remind the opponent to be careful when playing acolyte of pain. It also can trigger your Armor Smith multiple times which is very crucial since you don't have the 4 armor from Tank Up. Remember you are going to spend 1 card for multiple Whrilwind effect which is very important to Warrior in general.
So many potential here. I won't under-estimate Warpath.
Warpath is worse then Defile, but I think it’s still pretty good. Control Warrior often floats a lot of mana each turn, while waiting to set up the perfect clear. This is great card, especially consider that Ravaging Ghoul and Sleep with the Fishes are both rotating. A cheap/flexible board clear is great.