Wow, this thread is still going. Neat.
Personally I do get upset when they stray too far from the source material. There is a reason the studio is using that comic/character/story in the first place. Why bother making a movie based on a character like Batman (for a quick example) if you are going to change so much of it that its barely Batman anymore. For example, people are worried about the Ninja Turtles movie (although I think people are getting too worried before its time to, no one knows for sure whats going on yet). Imagine if they took that comic/characters and changed them from Earth turtles mutated by mutagen ooze into humanoid turtles and made them alien teens from space. While it may be a good story its not the Ninja Turtles. It would be like taking Batman and changing him into a poor guy who fights crime from his friend Alfred's garage. That could be a good story too but its not Batman. Or the GL movie they almost made starring Jack Black about a slacker who is chosen by the GL ring and must learn to be a hero. That too would have been a good movie, but not really connected to the comic we care about. Then there is the Parallax idea used in the GL movie, he was once a [BLACKOUT]Guardian[/BLACKOUT] who went evil. That idea drifted from the source material. Good idea, but where that idea lost me was his final design. While the original idea of Parallax ihabiting the ring and possessing Hal making everyone think he was evil and eventually revealing it was Parallax the whole time is a more interesting story, him being a former [BLACKOUT]Guardian[/BLACKOUT] worked too.
They choose the comic for a reason so why not try to use the source material as much as possible.
I was just noticing the other day, about the Avengers. In the months and months leading up to the avengers, with all the still shots released or leaked, people began to get upset. Some. I myself was somewhat disappointed in Captain America's costume design, parts of it anyway. But when the movie came out things were moving so fast that changes to the costume didn't really matter. Things like his arms being white like in the comics, or him having some chain mail on his chest. And even things I thought were so cool, like the ton of detail on Hawkeye's costume with all the zippers, buckles, straps, different layers, patches, etc, weren't really noticeable.
Some of the problem could come from the amount of time it takes to come out to the theaters. During that time lots of stuff gets leaked, people look at still images that many times are without the final effects,and people get upset about small things because at the time they seem more important. Like me with the parts of Cap's costume that in the movie actually wasn't a big deal. So I think the Internet stuff that is released can actually hurt the film a little. Maybe if the movie just came out without much anticipation then we would go into the theaters without predetermined ideas about the films.
I'd like to hear non comic fans actual reviews of comic movies. My parents aren't comic fans but they also aren't much fans of comic movies either. I would be interested to hear from fans of movies who haven't read the comics to see what they think... or would I. I might end up yelling at the computer or TV screen because that person's review stated they hated the Avengers as a movie or something.