I don't know, I seem to be able to get plenty of kills with a shotgun alone when the need arises (IE: Take objective A and your ENTIRE squad is busy respawning). I mean, it DOES light you up like a sore thumb, but at the same time, if nobody can kill you, what good does it do them?
Dont think knifing upgrades are really worth it, but yeah the electronics ROCK. Go in with motion, sensor jammer, walk crouched instead of run, and go in with silenced SMG, and man, you can boss the place without them even noticing you.
I am the punishment of God...If you had not committed great sins, God would not have sent a punishment like me upon you.� - Shaka Zulu