My 2 cents:
Classic Startup pitches (Non-LeanStartup) contain a lot of pure guesswork and leave many questions unanswered.
Typical are huge customer segments and target groups, unrealistic (too high) coversion rates and no real idea about go to market (and its costs!)
Beeing at the "Dragons Den" of the Startup Founder 101 Meetup in Munich last week, I saw several people pitching their startup in five minutes. I always wondered:
My thoughts what would help a lot:
Sadly I missed the "LeanStartup"-startup 99tastes.com from Christian and André of our LeanStartup Munich Meetup group.