This probably would have been better in the Suggestions forum, but nonetheless, I like the idea, so things I'd like to see:
A straight W/L ratio, perhaps mousing over this would display W/L for Solo/FFA play, and W/L while as part of an alliance or pre-match beginning team.
Then out of their Wins, would like to see a break down by victory type. Wins by conquest, Wins by Diplomacy, etc.
I'd also insist that each player have an option to hide some or all of their stats if they wish.
Then perhaps on the less practical but more 'fun' orientated stats to track, maybe things like:
Units designed
Units produced
Units lost
Units killed
Highest damage inflicted by a single unit
Most Units killed in a single turn
# of times researched technology x
# of times maxed technology research in a single game
etc etc etc. Could go on and on and on with things like that. 