As always in the WWW there are good and bad cookies. Some are really needed for websites (like session management and stuff) others are somewhat neutral (tracking your likes and thus providing ads which fit to you) others are clearly harmful.
For my part, I have a cookie blocker which kills hopefully most of the harmful stuff. Other side of the coin is, I have to whitelist everything I want to allow. But that is up to your decision how you want to deal with all this :)
I would be happy if you would allow me to track your visit for my statistics and also to display some ads (even if not personalized). If enough people choose to click on ads and have analytics track them, the more one gets for an ad. I will not get rich by this, but maybe (at some point) there is enough there that I can buy some paints or stuff, which I could make a review on or so ;)
So far for this more technical update. If you have questions about cookies and stuff, feel free to comment, maybe I can help you (if it gets not too far).