Unless it already exists I think there should be an option when you view someone else's profile to see if you have ever played in a game with the person and see your historical matches together.

I would allow you to see who you have played against a lot and see if you've ever been in a big game with someone before but not really noticed them and then you could look back at the game and see what they did previously, if they beat you, how they RP for Diplo games etc.

I think it would be a useful tool for keeping track of grudge matches as well.

There is, on someone's profile page, under Common Games, click on "See games where we played together"

the only limitation is that it does not segregate the games where you played as teammates from the games you played as enemies. it would be really nice if it did.

It would be great if you could see games played between two other people.

@smileyleg {TJC}

I agree with you

Yes, an option to distinguish between games played on same team as them vs. games played on other team would be great. "Hey, check out it, when I play on opposite team as this guy I win 99% of the time, but when I play on same team as this guy I win 40% of the time? He must be astoundingly bad. Let's avoid him...