I'm just going to throw in my two-cents:
My SPM is in the top 8%, my W/L is in the top ten. I notice that roughly nine times out of ten I am either on top, or at least in the top 3, on my team.
Earlier today I was in a match on Scrapmetal and I was using a no-attachments, bolt action rifle and I was second place my team in a losing game of TDM. I got most kills on the server, and top accuracy rating. After looking through the battle report, almost everyone else on the server had either a fast firing assault rifle or carbine (specifically the F2000, A-91, ACW-R).
That being said, I do agree with what Dragonistic says about avoiding certain situations. I try to not play Conquest on Firestorm and Caspian because even in vehicles I can go entire rounds with less action that the opening minute of Metro. Do certain stats that I track go up because of this? Yes. Does it reflect my ability as a player because of this inflation? That's where the argument comes in. One can argue I only play in matches with high scoring potential, but then again the fact that I do get high score consistently shouldn't be overlooked.
I try not to get too into these kinds of debates because there is no clear right or wrong way; if you ask 50 people what they think about stats vs. skill you will get 50 different opinions.