I dont think there are any bad ICOs,  I think you mean if they are not scam or tend to fail after all. This is really one of the most important question if you wanted to invest in ICOs, no one could accurately tell if an ICO is real, scam, successful or failure because in their roapdmap and whitepaper, everything written there is good and promising. How the cryptoworld and the market reacts to it after the ICO is a very big mystery you can't predict.