Playing this beta preview and it's not bad, it's fun. Especially with the stealth portion.
Though one thing that bugs me.
This energy system is not set in stone is it?
I find it silly that when you use up your cells you can only recharge one cell. Anything more than one you need to use bars or something to replenish it. This severly limits your options if you want to cloak, run up to the guy, then knock him out before running away.