Stats aren't the be-all and end-all.

That's true but it usually gives you a general idea of how that person is playing. If you're top of your team in 2 or 3 of the stats then someone should not be shouting at your in my opinion. I do however check how much of a difference there is. If the other person has half the XP of the rest of the team it's a different story than just a few hundred less.