I have never watched any of those five other films that you have listed. I have no idea whether thay are rubbish or not. What relevance have they got to whether or not "Disaster Movie" is rubbish or not? I could equally well list any other five films which I think are excellent. Would that mean that "Disaster Movie" is therefore also excellent? Of course not.
Judging by the trailer, I thought "Disaster Movie" would be quite good - perhaps a bit like Airplane, which is excellent. I don't want my enjoyment of a film to be ruined by reading a whole load of stuff about it on forums before I have seen it, and finding out half of what happens in the film, and therefore I deliberately don't read spoilers about films which I haven't seen yet.
I hope this clarifies things. If you still don't understand the concept that I won't know if a film is rubbish until I've seen it, then that's your problem.