I have no idea how something like this would be balanced, and it would no doubt be OP as hell... but it's realistic considering the game is set in the future and we already have most of the technology needed to do this today.
The biggest weakness of such as suit is that it needs battery power, and even with advanced batteries, they have to run out sometime - meaning suits can't be issued to guards, patrols, or anyone who isn't going straight to the front lines. They will also weigh several tons, considering they'd be armor plated in depleted uranium over their carbon fiber exoskeleton, so transport helicopters would have problems carrying more than X number at a time.
I realize why lots of people will want to omit this from the game, but as I previously stated, it's realistic and very likely for this time period.
Please discuss.