Ive seen nothing like that, for me its what you are saying only in reverse. I went back to BF3 a couple of times after the beta and would just rage quit because of the stupid suppression and bullets going everywhere except where I was aiming. The only time I feel suppressed in 4 is when under fire from a LMG or vehicles. Its actually pretty easy to snipe people even while under full auto fire from a distance.
LOL try firing a grenade launcher or XM25 while suppressed. You have a high probability of suiciding due to the round firing into your feet while pointed downrange. You are correct though that suppression only comes from LMG's, probably because LMG's are the only guns so inaccurate to not instantly kill you before you realize you are under fire to begin with. But the thing is with BF3 you knew you were getting suppressed and that your shots would be inaccurate, it was a gameplay element you could count on. In BF4 it seems much more random, where a guy running around with an M249 (basically a full-auto M16 with 200 round mag) shoots 2 bullets in your general direction and your whole screen turns to mush.
Anyways my biggest gripe about BF4 is the constant spawning dead and insta-dying out of nowhere. But also little things like worse overall graphics in my opinion (especially soldier models), lack of footsteps, lack of sound locality, lack of damage indication, etc. I feel like I could play the game just as well muted as with the sound on, a ginormous leap backwards from BF3. All these factors really take away from the ability to play skillfully. 50% of my deaths are spawning dead. 40% are dying to people behind walls, out of nowhere, etc. Only about 10% are due to firefights that I lose, and probably half of those 10% I kill the guy that killed me simultaneously.
This game is just aggravating to no end, I don't enjoy playing it at all. BF3 had a few frustrating moments but for the most part I felt in control. When I died in BF3 it was because I reloaded at a bad time, or got flanked, or ran around a corner into someone waiting for me, etc. Not so with BF4, I feel helpless constantly. When I die in BF4, it's from a guy that spawned directly behind me and I didn't hear. Or a guy behind a wall that I didn't see peak out until after I was dead, etc.