Most of them are, but not all surely. Of course you should pick the best ico according to your preference and if you want to participate, then participate. Nonetheless, if you think an ico is not really worth it, why else would you join? As you pick an ico, you're putting your money (probably if you're an investor or trader) and time (investor and bounty hunter) on the line, that's why it's important to choose only those who you think would be the best for you.