Some of the movies you listed aren't classics for sure, but there is entertainment there (what's wrong with Miss Congeniality? A fun time at the movies
). In fact, I wouldn’t use bad at all for all of them, maybe flawed would for me best describe them. With Miss Congeniality, it’s possible the moment I saw ---Smurfette--- as a tough cop, I left the realm of plausible and entered “just go for the fun” and I enjoyed it immensely because of this, I don’t know, but I did enjoy it and for me, it’s not a bad film at all! What is “bad” anyway? As far as plot, Monty Python’s Holy Grail could probably be argued it’s a stupid, silly badly plotted movie. As a movie on its own, it’s one of the most entertaining 90 minutes you can spend in front of the screen.
Movies are pretty complex; they are a result of many factors which can all impact on our enjoyment, some consciously, some subconsciously. There is style, directing, acting, chemistry between actors (a subjective thing!), pace, script, plot, lighting, our own mood, expectations, etc.; that can affect our particular enjoyment of whatever we are watching; and some movies because maybe they aren't hitting a 10 in each category, can lead some to a loss in interest along the way.
Typically, I'm a consistent movie goer; what I liked 20 years ago, I still like as much now. There are some movies which age differently; for example, I don't see Romancing the Stone at the same level of high-quality entertainment as when I saw it in the theatres on original release. Aside from aging, one's own mood can also impact our enjoyment, our current thinking process, mood, RL issues can alter our perception/enjoyment of any flick. When I saw "Body Heat" in the theatre, I felt it was one of the most predictable movies and for whatever reason, it just wasn't working for me that day and I walked out, which has only happened twice for me, not bad considering I see about 25 movies in the theatres per year!. Anyway, saw it about 1 year later and for whatever reason, it worked a lot better. That's usually the exception instead of the norm, but still point is, enjoyment of a movie relies on so many things that it’s not always because a movie is bad that we don't enjoy it as much.
I'm not singling you out; I think we all tend to do that, just at different levels. For example you mentioned Boll's Far Cry. I haven't seen it but after 15 minutes of "in the name of the king" (one of his better ones), which is considered one of his better efforts, I'll admit if someone tells me they love his movies, I'd instinctively think this dude has bad taste in flicks, but I think my doing that is wrong. This same person could be the biggest fan ever of Army of Darkness, just a fun horror comedy and therefore I couldn’t say his movie taste is THAT bad.