There are aspects of each class that's "Meta". To say one is OP isn't taking into account the freedom of build crafting that this game allows. It creates a meta where some are better than others. Nightstalker does seem a little overpowered, though. They need to add a cooldown to On The Prowl. On top of that, the overall loop ability of invisibility needs to come down, especially when combined with RDM, while still allowing high skilled plays to be rewarded. I feel like making standard kills grant 1/3 class energy and precision kills grant full energy MAY be a good solution, additionally, instead, buffing ready/reload speed and airborne effectiveness on primaries MAY be a better weapon buff.