I give apps a one strike policy on notification spam. If they do it at all, I'm uninstalling it until I actually need to use it next (if I can't find an alternative). And the same goes for getting in my way to beg for a review on the app store: that's a shortcut to getting a one-star rating.

The main exception to this is the notification spam from Google asking me to rate call quality after every damn call. I don't have my phone rooted, so I can't turn off that category of notification.