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Maybe, for urban combat and rough terrain(See mountains) they might be functional, but in any form of exposed environment(Plains), they'd get fucked.
One of the important things is height and how exactly does it move, which is relevant to it's stability.
Anything taller then 15 feet is just a target screaming to be shot at.
Another important thing is locomotion, how the fucker moves. Two legs seems like a poor idea given the fact, you shoot one out and it's basically fucked.
Treads? Might as well just make a fucking tank.
You need multiple legs, think of a spider or an ant, this is the best method for the simple reasons of, it's a stable platform, and since it allows redundency in case of damage.
In short: feasible, but unless there is actual practical thought and application in their design, it's fucking pointless.