Just as much as we have seen a lot of them succeeded, does not mean it is a totally scam free means of token sale or marketing.
I would agree they are successful in raising funds, the question would be are they successful in delivering the products? And that is what I am thinking, the hype of the project is strong I hope they are able to meet the expectations of the investors.
If you seriously desire to take part in IEO, which is a good move, either as a newbie and as an expert in trading and investment, limit yourself to exchanges that you trust, most especially those you have been using right from time or the top exchanges in the crypto space.
This does not change the fact that the project can have a tendency to do an exit scam, Everyone should only invest what they can afford to lose. Profit is good but too much greed can lead to disaster.