It can be good or bad depending on the ICO that you invest in. It's kind of a silly question to be honest. If you click on the first ad that you see on Google advertising the next best ICO since sliced bread than you will have a bad experience. If you do due diligence, avoid scammers, and invest wisely than you are more likely to have a positive experience. Avoid scammers, be careful of these forums, do not trust ads, ignore trollboxes, and you might have a shot.