ARAM: World of Tanks

I actually love tanky champs. I think they can be real fun, but there has gotta be something done about some tanks doing insane damage without a single offensive item. Just played a really short ARAM game where the other team got rolled so fast it was almost not fun to play. It was a slaughter, and only because we had tanks. As I looked at the last few games I saw some patterns.

Tanks in multiple games carried the game (most damage on team in several of them) with only 1 or 0 offensive items. Watched a Galio just crush a team almost single-handed with one offensive item, then an Ornn that crushes the other team with 0 offensive items. Now I do not think there should be some across the board nerf for tanks (not all tanks have the damage overtune).

Maybe someone can explain the reasoning to me why some tanks can do such obscene damage without building anything offensively.