Efficiency metrics are good for evaluating the overall quality of a team, and there are resume metrics that are a good measure of quality wins like WAB (Wins above bubble) and SOR (strength of record). Someone with a high EM and middling SOR would be an example of a team that's performed well in the games they've played but their schedule hasn't shown that off fully. Houston is #2 in KP/BT and #51 in SOR.
Going the other way, a team with high SOR but low EM is a team that has a lot of good wins but doesn't ever look overly impressive. The prime example for that right now is Oklahoma, #3 in SOR and #54 in BT.
Press me to pick which is more impressive and who I'd take in a neutral floor matchup, though, and I pick Houston 10 times out of 10.