AMEN!! This approach is 50% of my own strategy. I share in holding / trading at least one coin you mention. I personally look for good concept/use case, good people/team, and how far project development and implementation has come since ico or inception. Strategic partnerships are a clear red flag as well. I think a wave of mergers and aquisitions will consolidate the quality projects while regulation will stop out the scams.
RE: Don't buy shi$$$ coins. Buy the good ones. Duh.