I don't know if I lost my sense of humor, but I find that there are too many useless apps in the AppStore...
Just to name a few:
Sound board apps
Simulated function apps (like finding a cell phone by its number...)
Joke apps (broken screen, remote farting...)
Apps that do no more than the default apps like Notes, sound recording...
Shortcut apps to some websites
Surely there are other type of apps that could be considered useless but that's what I have in mind for now. Should Apple filter those apps out by setting a policy that would ensure that the app is actually doing something interesting?
Apple did already some cleaning in the last year, since there seems to be less of those now than when I got my iPhone in 2009.
What have you found to be completely useless?