Well, basically, when I switched to this style of play, I almost always dominate.

Think 35/5 or 31/3 , I don't think I am far from 30/0.

My question is, is this tactic valid? Is it too overpowered?
Am I considered a "noob" for using it?

At first I played with Scar+Laser which then was branded as a bug, so I switched to MK Mod as weapon of choice, and was good with it.
I decided to switch my playstyle and now I use Marshall with Stealth Enhance,Energy Transfer,Mobility Enhance.