MES is currently bugged. We'll be fixing it soon, but I wouldn't expect a return to it's former levels of power.
Sir - the -main- thing that made this power useful was that you would 'decloak' when you fired, and cloak didn't allow that.
The power would be balanced and useful if it powered down weapons, and didn't make you 'cloaked' under 5k. There's still a great deal of utility in concealing movement without it being a superior replacement for cloak