I usually like to analyze fundamental reasons when looking at an ICO, but sometimes other reasons may be almost as important.

Let’s look for example at GRID+

First of all we can clearly see the strong presence of ConsenSys behind this project:

ConsenSys

Second thing the project seems to have been in preparation for quite a while. This is an important sign, the more the project has been in preparation the better as it means that the team was focused on delivering something of quality and was willing to wait before raising funds rather than just having an idea and rushing to raise funds.

The project also seems ambitious and credible (mostly because of the participation of ConsenSys):

The project also seems to target the long-term and to be very ambitious. This only adds value if the project is credible, but considering the ConsenSys backing I believe this is probably the case

The last point is the fact that it is currently traded only on EtherDelta, one of the most difficult exchanges to use. This is usually a good sign, meaning that eventually it will probably be added on some more mainstream exchanges which has the potential to give it more visibility.