For someone who has no experience with the Battlefield series can you elaborate on what you're referring to..?
Having around 700 hours in BF3, and close to 200 in BF4 I still find myself playing BF3 especially now that summer seems to have rejuvenated the servers.
I'm checking in on this just before I hit the hay for work so I'll drop in tomorrow and go into detail. but basically BF3 gun mechanics felt more realistic than BF4 and just more satisfying in general. They tried to make the changes subtle but to me they are glaring.
I don't dislike BF4 as a game, besides a new host of maps, most of the feel is still there and some forward steps were taken in other areas. IE spotting isn't as spammy as in BF3. Spawn interface is way better. 5 man squads is better than 4. Re balanced defibrillator, solved the Claymore question etc. But everything related to gun mechanics was a step backwards.
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I'll explain one part now.
Have you ever played a first person shooter where your using a semi automatic sniper rifle with high recoil and you've gotta pull down on the mouse violently to try and keep it under control during rapid fire ? Well imagine trying to do that with a console controller, you wouldn't be able to control the camera sway/bounce and would become disoriented quickly. So what they did in BF4 if you were in a similar situation, like being suppressed while aiming down an 8X scope, your sights don't bounce as much and instead your bullets simply don't go where the aimer is, so controlling the sway becomes a non issue and you can aim right on the target, (but still miss).
To add to this, the main weapon where this phenomenon would occur, the DMR class, no longer plays like a semi automatic sniper rifle, you can't even put a scope on them, your limited to 4X sight and they just ain't fun like they were in BF3.