the uchiha clan get massie head start in life by unlocking the sharingan but still trail others and i believe without it there would just fail
i believe an uhciha losses about 60-70 percent of there over all power without the sharinagn
sasuke would be weeeker then lee without sharinagan and itachi without ms and sharingan would be well dont want offend anyone but wouldn't enter the top 30
From hype it's suggested that the Uchiha clan in general were naturally gifted talented shinobi. Even without the Sharingan Sasuke showed great promise early in the series. I know you can't generalize an entire clan's power from one (or even a few for that matter), but that just seems to be the way Kishi intended to present the Uchiha