The Spurs are a rather quiet team, like poison--silently destroying opponents. The Spurs against the Rockets in Game Six sucker punched the Rockets from the jump which was unexpected with the Spurs’ injury woes.Their stars and their supporting cast don’t say much but they play hard and it shows. Kawhi Leonard, who has become the face of the Spurs has continued the quiet nature/humble nature that started with David Robinson many years ago. Overall, the Spurs are a unknown team and casual fans are attracted to the flashy not the humble.
The NBA is marketed towards stars and that same marketing shies away from the “team-concept”. Basketball at the end of the day is a team sport and a discipline team can overcome superior talent at times. The casual fan isn’t use to seeing that and so they tend to pick more talented teams over the Spurs without realizing that talent isn’t the whole question to winning. That's why teams like the Celtics and Jazz did so well this season, its the reason that the Spurs could close out the Rockets without Leonard because they run a TEAM system not purely an INDIVIDUAL system.
1) Golden State Hype:
Several people are automatically choosing the Warriors over the Spurs despite the Spurs beating the Warriors candidly in the regular season. Now, one can argue this is because of the injury to Tony Parker, but its likely because the Spurs aren't a sexy team. Again, people are in love with how talented the Warriors are on paper versus how the game could actually turn out. The Warriors are a very small team inside and their not as good defensively as the Spurs. And as we saw in the Rocket series--defense wins championships in the long run.