These actually seem pretty good to me. Obviously none of them contains enough information to tell if its a good idea because not enough of the idea is expressed in this format. But in the context of the format, it seems like a good list.

eg "Basecamp for travel planning" sounds plausible, but it doesn't tell you a huge amount about the service. If this was being taken on by people who know UI and have a interesting take on how travel planning could be simplified, I would not dismiss it.