MBT APS (Missile Intercept System) is very weak, doesn't make sense.

Either extend the duration or remove the startup time.

Startup time makes it impossible to use reactively, so you're encouraged to use it proactively. But the duration is so short that using it proactively is often a total waste. I'm not suggesting it should last for 10 seconds or anything crazy, but it seems to only last for ~2.5-3? With a ~1-1.5 second startup. 

I would prefer just to see the startup removed so you can use it reactively. BF4 APS was near perfect, not sure why huge sweeping changes were made for this attachment. At present it is just very frustrating, and contributes (along with the broken RPG) to vehicles feeling very inconsistent without a squad of engineers on your **bleep**.