hmm.. allthough stats would be cool, statwhoring can ruin a game.
IMO unless someone comes up with a very good system then stats should stay out.
the ONLY example of stats that work well (that i know of) is the TF2 stat system, it has no global stat record, but instead it compares you to yourself- ie it will tell you when you get close to / beat your previus kill streak record for that class, or your record of objectives acheaved in one life. - you can also compare yourself to peeps on your freinds list.