I agree with you for the most part. It was poor play, like I said, but I do attribute a lot of it to the coaching for each team. You're right, face-guarding Miller and opting for Anderson and Z to beat your isn't a great move, but it's one of the better ideas for guarding CPA, IMO.
Even if the "players played as their coach's instructed," Clayton and Slater both missed crucial shots, namely Slater. Late in the game, he should hit those shots at the line. And you have to admit, nearly every 3 he (Slater) took bricked, not just missed.