well theres more to trade off for a suppressor, which is why ive seen more of those 'pro' cod players running their guns loud in recent matches.
quickdraw, sleight of hand, thats all attachments now. so lets say you have a gun with bad iron sights and a slow reload, then you're gonna be using a red dot or other sights, and sleight of hand, now you gotta use a wildcard to get a 3rd attachment, now you gotta pick either quickdraw or suppressor for example. of course this isnt a route anyone MUST take, just an example. for myself though, quickdraw is a must if you're up against decent to good players.
with all of this freedom in the new pick 10 system, I think alot more people are gonna be running their guns loud anyways.
Silenced AR's were good in BLOPS? The only gun that seemed to get better with one was the Galil. Silencers were awful in BLOPS. The only guns in COD I've ever liked with a silencer was the TAR from MW2 and the Galil.