These companies seem to solve very specific issues. It's possible they plan on building a sustainable business model before growing to tackle bigger challenges. Was Google a "big innovation" when it launched, or just another search engine? The world is 500 startups richer and there's nothing to be disappointed about.

Edit: A better example.. Amazon was just an online book store. Now I can't launch a website without getting them involved.

Edit2: I looked up Tealet and it seems like a well executed vision. Writing them off as a disappointment is a dick move. Where are your mind-blowing innovations?