Quite surprised to see Dogecoin in this list. It's actually doing a great thing to the Bitcoin community by expanding the user base of cryptocoins.

I came to believe that bitcoin proponents can be a little bit arrogant to other altcoins just like the traditional financiers are still arrogant towards bitcoin itself. There're still huge things to come, as the market is not developed yet at all.

My point is, this thread would be way better if you offered advice on how to determine whether the altcoin is likely to be scam.