None, don't buy ICOs. Instead wait for them to be dumped post ICO and buy when they are at a low a few days after the ICO is tradable. Right now is not a good time for ICOs, most initial investors want to make a quick buck and dump immediately.
Unfortunately, this is getting to be more and more true with each passing ICO. Wait for the dumpers, and get your tokens from exchanges. Then you don't have to worry about missing out on huge presale bonuses, missing transactions, tokens delayed, etc. Tokens are listed, means all the growing problems with ICO are done, and you are almost sure to get them at a far cheaper price than ICO.
Blame the bounty hunters. All running up reviews and copy pasting to try and cheat the projects. They'll sell at any price too, since they get so many for doing nothing.