Build upon the current stat menu by splitting stats down across various classes. You could have a section for each class, with unique stat trackers to each class. This helps differentiate different players stats when comparing against eachother, as comparing an Assualt and recons K/D would be like comparing apples to oranges.

To further build on this, this would make it easier to add a "global leaderboard" stat menu where different classes have different records they could compete for.

I personally would love to see "top score, highest kill games and longshot" records be part of a global leaderboard.