Interesting point of view.
I'm on exactly opposite end - I'm going deeper with ICO's this year.
Your points are pretty valid, but this mean you just need to be more peaky where you are investing. And I'm always and only buying during the pre-ico phase, avoiding those ICO's with massive pre-sale.
I agree there are so many ICO's with great projects all you have to do is to go deeper into there Projects white paper and ensure you get information that you need. for me i am satisfied with the ICO's that i am in. I was also scammed once but this doesn't makes me discourage becs. i still believe in ICO's.