I always use
Fourth Duration Website quality
If the site is poorly made, many bugs in the interface, poor graphics, then either it is made for illusion, or team has not normal programmers. Both options, of course, are not a good sign.
This is very helpful i also always check the quality of their website before entering their Bounty Campaign.
It still comes to my mind how do we distinguish whether it has these sign or not. Some of the bounties are abusive knowing that we have hope that we'll get tokens after the bounties.