I appreciate the sentiment but in this case, wouldn't that make boring movies bad and interesting movies good? (Assuming, of course, you don't want to be bored...)
Birdemic is a bad movie, in that none of the individual components are good and they don't complement each other well at all.
I'd argue that both are interesting
The irony of it is that if they had tried to make those moves "bad" on purpose, they wouldn't be interesting at all (at least not to me), and they would just be "bad" on every level for me.
In fact, even when there is sincerity, it's not a truly deterministic system. I think that the first Troll movie is technically objectively worse than Troll 2, but I find Troll 1 to be pretty boring, in addition to being incompetent, while Troll 2 is silly and an utter blast to watch.
A boring movie is something that I genuinely felt wasted my time. I got nothing out of it, and I couldn't even get a lot of enjoyment out of making fun of it. The perfect example of a movie in this category is the 2009 movie "9" (sorry if that's your favorite movie).