http://tremstats.dasprids.de/top_teamkillers.phpTop Feeders
1 [mDc]ThOrN
so its accurate

not only is he a TKer but a top feeder hehe :PPP
ok, back to reality, should be top teamkillers there
Can you calculate hp taken/hp given instead of kill count? I dont know how detailed defauld log is, but with cg_debugevents 1 it shows HPs taken + armour ratio, that would be more valuable info, plus you could take armour ratio/alien evo into consideration while computing Efficiency. Player killing tons of BSes/tyrrants is more efficient than some lucyspamming dretch hunter. Efficiency will suck for someone struggling with a dretch against BS hordes as it is, even if hes oh_so_l33t and kills a BS every 3 dretches.
Ideal approach would be to look what evo(amount of creds in equipment) player had while dying/killing other player, and then calculate Efficiency.
Now Efficiency is heavily favouring humans.
something like
Destroyed Structures
Egg 4 (432hp)
would also be more valuable info
EDIT:
plus a category "top base killer" would be nice (does your stat script count only proper kills, or TKing own turret = kill?)
Being able to click "Machinegun" and see other players stats with that weapon would be nice, same with "Reactor" and other buildables.
Being able to see whar evo/buildable was killed with what would be leet

like
Dretch:
machinegun yyy (xx%)
Flamer yyy (xx%)
Lucifer Cannon yyy (xx%)
Blaster y (x%)
OM:
blalballba
and so on
EDIT2:
or just split it to 2 sub categories "alien" and "human", that will make dretching BSes less stressfull

EDIT3:
sorting on kills Team Kills Deaths would be more than nice
and you should know that efficiency is broken, just look at your stat :
38 [db@]DASPRiD 473 12 1069

we all know that running after wounded tyrrant EVEN AS A NAKED humie and dying a lot is BETTER than turrethugging with BSlucy
EDIT4:
So its great except efficiency, it should reflect how easy it is to chomp 10 naked hummies compared to 2 armour/hat/plasma guys.
EDIT5:
I killed 1 OM and 2 reacs, + got 33 kills in one game
http://tremstats.dasprids.de/player_details.php?player_id=72shows one reac, no oms, and 21 kills?