Wow, I've put more than 50 hours into Multiplayer and just today found out that after returning to the lobby, you can press left and right to scroll through more detailed information on the game summary window. I wouldn't have known that but during the load screen that was the tip that I got.
After all these times seeing usless tips about how you can use other things in the equipment section besides frag grenades, or that killstreaks can be unlocked by leveling up, I finally get a tip worth reading!
They should have made the tips a bit more organized rather than just random apparently. :/