So, been playing this for just under a week on MP. Prob about 1-2 hours a night on average, which isn't long really... Rank = Sargent 2nd Class [Lvl 17]
Here is my experiences..
Newbies will not stand a snowballs chance in hell of competing in MP matches against those players who play this thing, what looks like 12 hours a day, since it's beta release. If you haven't got the latest and greatest weapons and perks attached then you're gonna struggle mightily until you grind it out for days/weeks on end to get any kind of respectable and competitive weapons.
People who have lvl 100+ either need to get a job or need their mums and dads credit card taken away from them cause they've no doubt bought their way to that kind of level status. It's not a system I agree with in gaming cause it's just another easy cash cow for the developers of these games, so I don't adhere to fast-tracking.
Due to the above, I find that on average I get between 3-9 kills a match, Nine is a very good game for me, but the kills are gradually increasing as I start to get more familiar with the maps and the areas where snipers tend to camp out. The SMG LMG is certainly starting to help in getting me more kills compared to previously unlocked weapons. Certainly notice however that those higher ranked players take a lot more shots to take down than those I give at them in 1v1's. They also appear to know exactly where I am, so must have some kind of tracking perk at their level which spots the lower ranked players more easily on the map.
I will put up with getting killed sometimes 15-25 times a match for the time being in the hope that when I eventually reach those similar levels as those hardcore 24/7 players, then skill and some tactical element may come into it a bit more and kdr etc will start to become a bit more respectful.