A few triggers can help you:
1. It's an ICO? 100% scam
2. It's premined? 100% scam
3. It's not minable? 100% scam
4. It's a clone of another coin? 90% scam
Hope this helps and I also hope you guys have some brains to choose a few nice, fair, decentralized coin to invest your money and not all those shitcoins.
this is exactly the issue.
you come up with some guidelines like this or anything similar then it becomes "just your opinion". for example i agree with 1 and 2 but not 3 and 4.
a not-minable coin doesn't have to be scam.
and a coin that is clone of another coin is 100% scam.
and that is just an example.
on top of it, i am only in it for the profit. a shitcoin can also give me profit. scam or not scam doesn't matter when they get pumped 300% in 2 days, it can give me the same amount of profit than any other altcoin can.