Only message I've ever received was a Mercy complementing my D.Va play on Honamura Defense. It was us and 4 DPS, and we never saw our teammates after A fell early on, except when they ran past us after spawning.
They were doing work out there though, because we sat on the point and took wave after wave of Roadhog, Lucio, and Hanzo, but never saw their 2 Genjis and Tracer. We won, with Mercy doing some amazing Heal/ Buff switching, and nailing 2 clutch rezzes.
I have never felt better playing D.Va- zipping from target to target, knowing I was just desperately prolonging the inevitable loss- and trying to recreate that feeling is what keeps me playing, months later.
Sidenote: I was typing a thank you message to her when I received hers. Overwatch is pretty okay, you guys.