A little thing I really liked as a little detail in Dawn of War 2's "War" subsection of your Career Multiplayer stats was that it showed the total number of infantry killed through your lifetime. I thought it was a cool detail, and that it could even possibly effect some sort of mechanic like XP or Levelling up a sort of "Multiplayer Profile" ala DOW 2.
Perhaps even with a specification of what you killed? I like to think of it as a sort of thing you can faux brag about - "I'm a Veteran SM Commander, I've actually killed over 10,000 Orks! What've you done?"
Like something cool you can pour over to give you a feeling of your overral lifetime performance in multiplayer.