Been playing since the open Beta headstart, 35 hour or so by now. I seriously love this game.
Matchmaking feels weird, but I guess that is because the MMR were wiped and veterans get dumped into newbie games (or the other way around).
I think in our third or fourth game we (3 people) got thrown in against a veteran premade who stomped us hard.
I really like the PotG feature, I think its a geat idea. Not so much if it is just generic Reaper ambush #3185, but quite often you see something that was masterfully played or something you wouldn't have been able to come up with yourself that you can copy. It is quite helpful.
My own personal favorite was when I was playing D.Va on Kings Row. My team was pushing the payload during overtime and currently located in that S shaped bend before the end. Enemy McCree was charging his ultimate at my entire team, while I was just arriving from further back because I was respawning my mech.
While McCree was charging I managed to charge between him and my team, turn midair and activate the shield a heartbeat before the gun goes off, saving everyone (we even won the match afterwards).
Of course one of our offensive players complained about that being shown, not his own (and "better") 4 player multi-kill.
He even complained about that for a whole 2 more rounds before he left.