SKILL LEVEL IN BF3

Lately,i've played a few TDM's and have started to up my K/D ratio. I was looking at battlelog and saw a game where i was 28k for 19d but my skill level was -0.81. How comes???. Then i found this -

This is what determines your skill level on your stats page:

• You gain/loose SL based on every confrontation with another player

• Killing a highly skilled enemy gives you more points than killing someone less skilled

• Points are not transferred from a player to another, they are simply added/subtracted based on the encounter and the SL of both parts (thus, after an encounter, one part may go up 50 points while the other loses only 20)

• The SL is used for matchmaking

Helpful or not, i don't know. I for one am not bothered.