This issue make the collection filter useless for me;
PMS sees the TMDB collection ID (from the agent) and makes a collection out of it even if user only has only one movie of the collection...
And it creates a Collection even if the movie is in scripting or in development... lol.
I would suggest having an option to force to only show collections with more than one movie from it. (additionally to the TMDB Collection ID)
This would make the difference between useless and great!
Hope I'm not alone that would want that...
See the TMDB for I, Robot 2: http://www.themoviedb.org/movie/58460-i-robot-2 or from IMDB: http://www.imdb.com/title/tt1083849/?ref_=fn_al_tt_1
In development... maybe in 2015... This shouldn't be a "Collection".