It is if you play aggressively. Normally, you'd cloak into a mid-firefight reload or when you're trying to get out. Without the bonuses from Nano-Armor cloaking you'd either get yourself dead and/or tracked down a lot quicker. Then again, the resistance does NOT stack with Nanoweave anymore, and max rank NAC is tougher than max'd NW, anyway. NAC is a lot more situational, much like Stalker. The default cloak is like most other defaults: Decent enough at all situations, but outclassed in specifics.
It's to make up for the lack of Rez/Healing Nades and C4 that Cube's removing, of course. All srsnss, I just now noticed wrong forum, too.