On the whole, I'd consider this a successful season for the Rockets.
First, they greatly exceeded the expectations of the pundits, odds makers, and the fans. And, truthfully, Harden was able to move on from the bad vibes of the previous season and buy into a system that asked for him to involve his teammates more. That in of itself has to be a success.
Houston also seemed to have developed an identity that works in the modern NBA. They do need to find someone reliable, that can be a low maintenance (usage) secondary perimeter offensive facilitator. Lou Williams and Eric Gordon are guys that can get their own shot, but they aren't really facilitating anything. Maybe a bit more toughness and size in the front court off the bench. I think they are hoping Montrez Harrell can be that guy eventually.
Losing Nene late in that series hurt their depth. That's where the Rockets failed, and the Spurs won. That what the Spurs do, and it's why Pops can justify sitting his guys during the season. He doesn't care what the league office thinks, because he just gave them a huge middle finger.