I have absolutely no problem with collect-o-thons in games.
Who does it hurt? Nobody.
The completionists get what they want in the sense of having more to do after the game is over.
The non-completionists get what they want by not having to worry about trivial pursuing of things that dont affect the game play.
Batman:Arkham asylum was very bad(good?) for collect-o-thons. Those damn riddler puzzles are enough to drive you to insanity (Maybe a huge irony for the game?)
this is pretty much my feelings on the subject, for me I just play a game to play through it and beat it, for those who want some more replay value / 100% complete it they can go through and try and find every little hidden thing.
in a way collect o thons are kind of like the precursor to achievement points in games - even though collect o thons are still in games and you usually get achievement for completing them, they are both born out of the same type of idea.