I'd rather see MM rankings than K/D ratios and W/R ratios, which are very easy to artificially raise.
I think it would be cool too, but maybe just XP/level. I could see there could be players out there that would simply drop from games if they didn't have good enough run or it didnt buff their stats well enough .. ALT-F4'ers, who are more interested in their stats/leaderboard than having a good game. That could be a detriment to other players IMO.
A lot of people wouldn't care. Trust me: I play World of Tanks too.