Halo 4 Didn't really fit expectations

I’ve been playing the game since launch and now I notice that it doesn’t fit expectations. I mean it is an amazing game and I love it but the AR,BoltShot,Suppressor didn’t fit expectations! The AR is too underpowered. The BoltShot needs a little bit more range because I was like 1 foot away from an enemy charged it,shot it and only his shields went down. The Suppressor takes too many shots to kill an enemy its -Yoink-. So if they I recommend a weapon update for this game around Christmas