For home users, the Security Center (SC) is great. In a corporate environment that already has all these things taken care of, it can be a nuisance. If the computer starts popping up alerts and windows telling a user to turn on features, it would be bad. Not only the number of calls I would get, but the amount of time fixing it would suck. We control the patches that get applied, the anti-virus/malware protection, and the firewall settings. For home use with a single user, you can configure it with no problems. If you add users and you don't want them to have to deal with the SC, then use prathapml's solution where it disables alerts for all users. The SC will still be running. It just won't annoy anyone. I hope this clears up why some people would want it disabled.