Maybe…

The best mech scenario I've ever come up with would be something fast, nimble, and relatively small. Like less than 20 feet total. You wouldn't be aiming to make a walking tank, more like an on foot attack chopper. The ability to change directions within in a couple of steps to keep from being hit by vehicle mounted guns and enough firepower to threaten infantry and light vehicles… yeah it could be fun.

The closest thing I've seen on screen would be the mech in District 13, but without the (currently?) implausibly powerful weapons.