Yeah, I agree Lev.
But it does tell you some basics about a persons ability as well.
For example if a person was just playing an arcade style, who cares if you die, Quake arena, you would think that their K/D ratio would suck.
Huh do I mean much like Jack and Beet.  Ahh beet I wanted to lump you in there, but alas I cant.  Good job, nice K/D history, you at least do fly to live.  But jack ole boy, for god sakes your K/D was .9 last tour.  You bet I do.
So then I thought ok maybe jack is just a little slow.  So I looked at his Hit%eges.  Low and behold they are respectable.  It at least tells me that jack can hit the broad side of a barn.
So then I started thinking.  Hmmmm a familiare pattern...  can hit stuff but never lives.  What does that sound like.   One more time, kills stuff but kills himself too, alot.  Wait, I got it.  Suiciders.  Quarter wheeling, arcade, unlimited death sweetheart bag fuel porking Jacal1.
 
 Thats what his score tells me.  So I agree, score is not perfect but The components of the score are telling.