I’ve actually defended Spider-Man 3 on these forums before. No matter how many times they said it, it was not a “franchise killer.” Raimi wanted more time to do a fourth one and the studio wouldn’t (couldn’t?) give it to him.
Also, the infamous dancing sequence was meant to show that Parker was tragically unhip, that trying to be cool didn’t fit him in the slightest, and that the symbiote made him into something that he wasn’t.
Don’t get me wrong, it has a lot of flaws and I haven’t seen it in ages, but the movie has a 63% on Rotten Tomatoes, which sounds about right. It’s really not on the level of the terrible movies that HDTGM is supposed to be about.