That might be arguable. 😛 First off let's just admit that faithfulness to the original source material has never been a priority in any of these movies, most of them are pluck the characters and their abilities, although Xavier's school is featured, from the comics and build practically an original story from them with fleeting reference to the source.
For X-Men 1 &2 even if things were juggled a bit, especially Xavier's relationship with Magneto, these first two movies in my opinion, of all the X-Men movies were the most true (if the word can be used), to the original source material, besides being excellent movies in their own right. I'll always be pissed off about X-Men 3 (Last Stand) with how they destroyed an excellent opportunity to start the telling of the Phoenix Saga, but that was not Brian Singer at the helm. We'll, have to agree to disagree. 🙂