I could agree with Joshua Porter’s list more:

1. Focus on social instead of personal.
2. They solve too many problems, or try to.
3. They’re about making someone other than the user happy.
4. They sell it the wrong way.
5. Not in it for the long haul.
6. They show too much of what’s going on, and get gamed.
7. They don’t have an underlying business strategy of improving people’s lives.

Numbers 2 and 4 are problems common to web companies creating thier own aps.

Numbers 3 and 5 are problems common to companies working as outsourcing partners whose client is not the end user but the software owner/funder.