Just wondering that "what can a laser sight do for you ?"
It doesn't make ur weapon heavier and what else ??? Show ur enemy a laser beam.... !?!

Yeah, it turns you into an enemy magnet

It decreases the spread of hipfire. So its good if you aren't going to use sights.

1. Hipfire in Crysis 2 is generally terrible, so the laser helps with this
2. It lets you play like Crysis 1
3. If you're a really good player you can use the laser to attract attention so enemies attack you, you kill them, your teammates stay alive, profit!

Yeah I forgot, it helps you to play like Crysis wars except the laser is less accurate, harder for you to see, and easier for enemies to see XD

Its raises the difficulty a bit XD