Mesh: (14/15)
A very well constructed mesh, I think it went perfectly the way you wanted it to.
It didn't really give me the idea of "flame" or "fire" (the wood would easily combust!

).
However, it is low poly and a great mesh overall.
Animations: (9/10)
My favorite set of animations out of the group. These were done wonderfully, and acted very naturally (to the Warcraft 3 nature that is)
The one thing that always drives me crazy: A perfectly still animation (your stand animation)
Textures: (7/10)
The textures were chosen nicely and used well, but that huge texture change on the barrel makes me cringe every time I see it.
Mechanics: (3/5)
Worked perfectly ingame, however I marked everyone down one point for not having attachment points. Also, the camera was still off, even though you fixed it. I would have zoomed it out more, or at least shown the barrel.
Effects: (4/5)
The death was very nice, however like the mesh, the attack particles could have been improved to give a more "firey" feel to it.
Creativity: (4/5)
Looked a lot like a normal cannon, but the new twist of adding fire to it aided it a lot.
Total: (41/50)