An X-men film must be done in the same vein as the comicbook; scifi-fantasy, adventure, drama. It's not rocket science, however it is difficult to pull off without the right talent. X-men needs the spirited, meticulous and artistic approach observed in the fantasy genre's better films.
X-men is way to complicated for the wam, bam approach and way to fantastic and exciting for the ho-hum approach. Like Spider-man and Superman before it, comicbook movies need a very spirited, meticulous and artistic approach. If not you wind up with either a hollow film or a film that falls way short of the source materials ridiculous potential to be a huge hit both financially and critically.
This is where having a vibrant and visual imagination comes in handy.............
.......imagine a full blown battle between the X-men and the Sentinels in the middle of midtown Manhattan under the hand of Raimi or Jackson......or the Wachowskis....
.......the birth and fall of Phoenix under the talented hand of a Raimi or Jackson...The fiery Aura of the Phoenix envelopes a reborn Jean Grey. The horror and emotion as the X-men fall one by one in battle, at the hands of the Imperial Guard. They try desperately to stay Jean Grey's execution by the Shiar.....the final tragic scene between Scott and Jean....
Comicbooks are wonderous spectacles and the better films in the genre capture that, without dumping the story or character developement to appeal to a larger audience. IMO, a fully blown X-men movie would probably have a similar feel to the Star Wars movies; very fantastical and dark at times, yet the characters and emotions are all relatable....like the comicbook.....
...Sadly, with that said, I am coming to the realization that we may never see a real X-men movie, much in the same way we will never see a real Batman movie. The investment (talent, money, etc.) needed to bring such films to the big screen fully realized is a risk very few studios would be willing to take--to many places where things could go wrong. Much better to play it safe and make a crowd pleaser than aim to high and fail.
What an incredible film X-men could be though?...Wow, the potential.....