a good ICO first and foremost is well funded
2. Has a lot of investors ( belief in the project )
3. Unique platform ( not your usual coin in the future )
4. Radical white paper and roadmaps ( here you can assess  what kind of changes or technology they want to adapt )
5. Has best bounty campaign manager ( best meaning they if they can pay for it, then most definitely, they can also pay for those who will promote it )