I started to read up on the MP-APS because like you were mentioning, i didn’t really know what it did. It’s pretty cool that it will stop projectiles, even from a tank, so i figured that it would be perfect for Metro. It stops all the annoying LVG's but it won't stop a grenade, so it rendered itself pretty useless, at least on that map. There might be other applications it fits well with but, not receiving points from blocked projectiles and the fact that bullets and a grenade can take it out doesn't spark a lot of interest in using it, at least on infantry maps. Also there is a 10 second cool down between blocked projectiles, that’s a long cool down. I could see it possibly being useful when using a tank and you position it outside the tank but just not overly excited about it as compared it having C4 in that slot instead.