No, it doesn't. Them being decended from the son of the SO6P is irrelevant. That doesn't instantly make every uchiha child develop faster than any other ninja. This is disproven by the manga. Every Uchiha child isn't Itachi or Sasuke. Whether you like it or not, Kakashi developed much faster than Obito because of his intellegence. Bloodlines aren't the only determining factor. I'm sure there were plenty of weak Uchiha shinobi before the massacre that were weak in comparison to good non-Uchiha ninja like Kakashi and Jiraiya.
How many of the Akatsuki members were Uchiha? 2? All of them were very powerful in their own rite. There's examples of ninja who are probably wayyyy stronger than the average Uchiha was all over the place. Muu, 3rd raikage, 4th raikage, Orochimaru, Sasori, Hiruzen, Jiraiya, Gai, ect. What makes Obito strong is the fact that he unlocked the mangekyo and it had a uniquely powerful ability.
Uchiha doesn't automatically = Best.