Amen struggled a bit, but 18, 5, 4 on 47% shooting isn't bad... He is going to have many worse games than that. Anyway, you are missing the forest through the trees. Sengun played out of his mind, Durant looked good, the team was scoring incredibly against what was, IIRC, the single best defense in the NBA last year. AND getting some (but not enough) important stops. It was a GOOD game. And you are not going to convince anyone reasonable otherwise, because it is objectively true by all measures but the final result. If we had one more point at the end of either regulation or the 1st overtime, that's how you would remember it, too, because we would have won.
Err... disregard my above post @Hemingway. As you probably figured out by now if you read it, I thought you were talking about the OKC game. But it looks like you were talking about the Detroit game. My bad.