If by bad reputation you mean bad mouthing from gun techs that do hundreds of hours of work, it's impossible to compare a stock gun to timely upgraded model. I've seen plenty of techs use jgs/E1s as platforms for excellent performing guns.
And if by bad reputation you're listening to noobies... well you shouldn't. There's a lot of little kids running around assuming that all guns are crap unless they are full metal and shoot over 450fps regardless of metal quality or bb weight. It's quite a preposterous and delusional state of mind actually.

I mean absolutely no offense, but if the thompson was your first decent aeg, and the scar your second it's really a pretty clear cut choice of what will have been your best guns

But anyways, plastic on a gun cam be essential to a gun, like grip and most types of stocks. And like I've heard from you guys here and many other people, fps doesn't mean very much in a gun, the power and energy is more important than that, it shows how far and accurate it will go. Anyways, thanks for clearing things up for me. I forget occasionally that people on the internet can be intelligent, mature people, or immature 8 year olds.