(adsbygoogle = window.adsbygoogle || []).push({}); I feel like ever since the MSMC and PDW got patched there's nothing to use.
What sorts of classes should I try out? I feel so lost.

I would think so. Im not back to the lvl where i have scavenger but when i get there ill check or lmk

I always think Lightweight is a wasted perk considering how much better Flak Jacket is and if you're already using suppressor then Ghost would really be helping especially with a close range weapon like Skorpion. Even Hardline is better(if you use Stealth Chopper or higher). Shotguns would be the only thing I'd equip Lightweight on since it's predicated on getting to the enemy asap but people seem to like Lightweight even though SMG speed is fast enough and the maps aren't huge but hey to each it's own.

I really think primary gunfighter is a waste unless you don't use lethal grenades or multiple perks at all. Laser sight is nice but it's not necessary for hip firing and often it will make you focus on hip firing in situations where ADSing or a combination of both would've been better. Extended Mags is excellent choice for Skorpion because of fire rate and the reload isn't slow like on an MSMC or PDW so it works.

I really don't get the point of shock charges if you're using an SMG. It would be good for SND or something but honestly an EMP nade(as annoying is it is) takes a dump on a shock charge. EMP nades destory things, work through walls and you get way more scorestreak points for it. Shock charge is honestly better for camping or cutting down a pathway if you're capturing a flag but even then a concussion could even stop people in their path IF they don't have Tac Mask.

Lastly if you're using a pistol secondary you don't need Fast Hands since pistols pull out quickly anyway unless you throw back grenades or are a C4 throwing master.

try the smr with select fire or the type 25 really good for pub stomping

SMR select fire? For one that has been nerfed, for two it's way better in single shot and for three the ammo capacity is low so full auto would really be a bad idea.

A Scar, AN94 or maybe even MTar would be better than a full auto SMR. Scar kills in 3 bullets at ANY range and the reload is faster with better ammo capacity.

my best classes are mp7 pdw or msmc with quickdraw suppressor and scavenger to be silent and go on long killstreaks

Vector is the best SMG now in my opinion. I still think the MSMC is good even after the patch but I've been using the Vector with Quickdraw and suppressor good for rushing.