First, I agree with the whole "make better movies you blithering morons" sentiment. Although I probably will see Elektra...but I'm sure Catwoman was crap...of course I dont care as much for DC-based comic stuff anyway as a rule, and I'm not overly fond of Halle Barrie.
Next, if we're talking comic book movies...there is certainly a lack of lead roles. Most super-heroines are members of groups or teams, not the leaders of them or independent heroes. Also, comic books, super heroes, and movies based on them tend to suffer in credibility with the general public somewhat anyway.
I think as far as strong female roles overall... a lot of it is that movie people due tend to see a female lead as a means to atract a certain target demographic (males, especially young males) and so they play up the sex aspect and ignore the rest. But as has been said, thats not going to make a movie fly, if the movie sucks, not when guys can see atractive women on the internet more or less for free.
Really, I think it boils down to two things.
They need to stop trying to use sex appeal as a selling tool. In an action or sci fi or whatever other kind of movie, that isnt what most people are there for. If they want porn, they'll go online or otherwise aqquire porn...if the want an action movie, they want an action move and they want it to be good, and a scantily clad female isnt a good action movie.
Second, action/fantasy/horror/sci fi/comic book movies in generall need to be taken seriously by the people making them. It needs to be seen as serious storytelling rather than hackwork.