Bryan Singer was approached to do an X-Men movie. Bryan got info on the characters and was particuarly interesting in Wolverine. He was interested in Wolverine because Bryan was adopted and like Wolverine, wants to know where he came from. Therefore, Bryan decided to base the movies around Wolverine and him finding out about his past.
The X-Men movies didnt have to be based on Wolverine. Scripts from earlier attempts to make an X-Men wernt based around Wolverine. The 90's series was successful and wasnt based around Wolverine. X-Men Evolution was successfull and didnt focus on Wolverine. X-Men games (up until Wolverines Revenge) wernt based on Wolverine. Yes, Wolverine was a favourite among the comic fans, but that is a small percenatge of the people who would eventually see the movie.
Before the films are even made we have a Director biased towards Wolverine. There were rumours that FOX gave him a list of characters that had to be in the movie. Among those were Storm, who apparently, wasnt wanted by Bryan. I think from the movies that is obvious.
They didnt need to follow Wolverines story. There are 40 years worth of comics they could have chose from. They could have easily made an X-Men movie, without the focus on one person. Who does Oceans 11 focus on? LOTR focuses on Frodo's journey but he isnt the main character. They didnt need to make Wolverine the focus and main character, but they did. That resulted in characters like Storm and Cyclops being less developed. Cyclops was even used to make Wolverine look better.
They set out to make Wolverine the star. They have made him the hero, the fighter, the charmer. You can tell they wanted Wolverine to be the focsu by the casting. Wolverine in the comics, games and cartoons is 5ft 3. So why the hell did a 6ft 2 Hugh Jackman and a 6ft 1 Dougary Scott end up going to the audition? They obviosuly didnt put out a casting call for a 5'ft 3 guy. Since when have small people been hero's, fighters and charmers?
Bryan should have waited and made the Wolverine movie, which there wouldnt have been if X1 and X2 wernt focused of him. We should have had someone who wanted to make an actual X-Men movie. Like Brett Ratner. They should have let him on from the start. He was passionate about it. Singer wanted to make his life story.