I wanted to hear this entire series of videos before I commented on it.
Generally speaking I think the problem that has afflicted the entire Batman movie series, and to a lesser extent other super hero movies, has simply been that the guys doing it always want to make the property their own. While some good, and hugely successful movies have come from this, I don't think we have ever seen what could come from someone approaching the material respectfully, and trying to keep it more or less as it is within the comics without needing to "re-envision" everything.
I also think a big problem is the need for reboots, and deciding to pretty much constantly re-tell the origin stories of various characters. On a lot of levels, I think super hero movies would work better if they were done by jumping into the middle of the mythos, assuming audience familiarity to an extent, rather than needing to rehash the basics constantly. Half the problem seems to start with writers wanting to tell a well known story of a hero's origin, but to make it "differant" at the same time to put their own mark on it.
Ultimatly I think the correct attitude is simply that it's Batman's world (or whatever hero) and the guys doing these movies are just guests there, as opposed to those actually controlling it.
To be honest a lot of these characters have endured this long because the stories, as they have stood, have more or less worked for decades. "Let's make Batman a Ninja trained by Ras Al Ghul" might have worked for a movie, and spawned the popular Nolanverse, but really I think it's the tip of the iceberg compared to what would happen if they just decided to do Batman more or less without modification of the basics by the writers and directors. So far we have yet to really see a true "Batman" movie, since even the original vehicle with Jack Nicholson messed with the backround to have "The Joker" kill his parents, and what's more also killed the villain off at the end of the movie...
At any rate, I think right now we're seeing the potential for comic book characters in movies, but we haven't yet seen what can really be done.
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On a final note I think the problem with a gay director doing the last couple of Batman movies is that those sensibilities had no real place in a movie that was dealing with characters that were not gay. The thing is that he didn't just set out to make a good movie, he set out to put as much overtly gay "style" into it as possible, involving things like the bat nipples, codpieces, and other things that were inserted into the movie which just didn't fit the characters. Sure a gay super hero might very well decide to express than sensibility, but Batman, as well defined within that same movie series, is not gay, and wouldn't dress like that. This turned the movie into a bad joke.
As lauded as Joel might be, I think the bottom line is he's a crap director, at least for this. Being gay doesn't matter as long as he knows when to keep those sensibilities out of something, and really he's proven that he doesn't. Nobody would have noticed or cared (either pro or anti- gay) had he have been able to prevent himself from being so bloody flamboyant. Indeed I'd argue that people know Joel is openly gay in the popular culture largely because of this movie, few people really commented on it (or cared if they did) before these movies, rather the results of his work is what made it the pop culture issue that it is.
It should also be noted that whether the movie is that terrible objectively, it should be noted that there is more to this than the objective analysis. It can be argued that what Joel did was insulting to a very popular IP, and that he basically defaced it. You don't have to be radically anti-gay to have a problem with what was done with some of the characters in those movies (starting with the costumes). The overall thing comes accross as basically him creating his own personal Batman fantasia, rather than even attempting to do it right, and then subjecting all of us to it.
Also Ahnald's Mr. Freeze.... "Bane"... ugh. See the previous celebrity villains could at least carry it off to some extent, I don't think even one of the castings or writing for the villains worked. Even Uma Thurman as Poison Ivy fell flat, in part because while she's sexy enough she just doesn't sell the whole Poison Ivy thing either physically or performance wise. While they were there aside, Tommy Lee Jones and Jim Carrey did sell their roles substantially better.