What makes a service a good service for the mobile internet?

Good or bad will certainly be determined by the number of users that will use your service the way it is intended, and find it useful, entertaining, helpful, intuitive and so on.

Any service can be well-made, but with the mobile internet, the special situation should be at the center of attention: most of your visitors will most likely be on the move, on a bus, on a train, looking for cab. Most users of mobile services will generally have little time and suffer distraction from the surrounding environment. Making sure that sites are easy to use, intuitive and quick are often winning choices.