Perhaps it is because of my exhaustive real world trigger time with many platforms and variations on firearms but I think I get what your asking; it certainly isn't because I am any good at the digital versions of such as the smg bullet hoses

.
The first thing that trumps everything else to a disproportionate extent is the site picture. I always reflexively ADS whether it suits the combat or not which I am trying to break myself from doing. Until, I can though target acquisition is more important to me than probably most players and I cannot use some rifles like the Madsen (top mounted magazine eclipsing half the screen) and, the one I want to like the most, the Selbstlader 1906. I know the Selbstlader 1906 was early on a favorite of many medics but I can't consistently do any good with it. Obviously, the TTk should be the most important factor but it never has had the impact on my gameplay that it should in terms of hard data.
If I had to pick the one stat that immediately perks my interest and whether I stick with a gun or not is the rate of fire/recoil relationship of the weapon. For example, this is what sticks out the most for me about the MG15 (I prefer the low weight variant) because regardless of what is going on around me or the intensity of the action, the frankly vanilla, middle of the road rhythm of the MG15 is something that I can always be consistent with. It is in stark contrast to the BAR which most people adore when they play support and I enjoy the BAR a lot especially since one of my favorite personal weapons that I own is a BAR platform but hyper accurized, semi-auto of course and modernized in terms of ergonomics and materials used (synthetic fully adjustable buttstock vs the wooden one of the original). However, I find the high ROF of the BAR coupled with a tiny 20 round magazine to be a liability because if there is a lot going on or a close quarters combat situation and I do a panic burst and miss with the first ten rounds then if I am able to get back on target and take down the original opponent I hope like hell he didn't have a squad mate because I have to now reload(crazy that a full auto rifle has that and is one of the complaints I have about the BAR I own in that it is impractical for many bench shooting setups which is its primary use given it is modified in terms of being as accurate as possible and it's 10 lb plus weight unloaded means it isn't something one can accurately shoot while standing before fatigue sets in).
In regards to the scout rifles, I play fairly aggressively and don't play enough to know the maps and the engagement distances well enough to use the sweet spot to my advantage. Also, I am always going to be aiming center mass (another real world habit I can't stop in gaming) so I will usually need a follow up shot. For that reason, I love the G95 with it's straight bolt and not having to break your sight picture while your cambering another round for a lined up follow up shot. Apropos, this is a pet peeve of mine because with just a little training, the scout rifles with the traditional curved bolt handle do not require the shooter to break up their sight picture as the player does in game with a heavily exaggerated animation when cambering another round....that and how the Martini Henry isn't as representative in game as the ridiculously powerful big game hunting gun that it's real world counterpart was (yes, I know it is one of the most devastating guns in the game and that it would be a balancing issue to make it any crazier)... for God's sakes, one famous sportsman of the era(name escapes me) used the Martini Henry successfully to take down all of Africa's big 5 game animals... the bullet themselves were not jacketed and quite soft so admittedly not ideal for elephants due to their thick hides BUT, not to get too morbid here, were absolutely devastating on men. I saw photos from a medical textbook regarding wartime triage and those haunting images are what have fueled this admitted rant of a pet peeve.
Sorry for going of the tracks there but I hope some of that answers your question OP. I was planning on giving you a few more examples but now I am thinking about the Martini Henry' and the inhumane devastation it's 400 grain bullet (nearly 1 ounce of lead) did on men and I am out of the mood. We still are terrible societies but at least we're being a little kinder in our modern war devices on the bright side of things?