I could not disagree more. I seem to be the only person on the Internet that still thinks "X2: X-Men United" is still the best superhero/comic book movie. And yes, I've seen "The Dark Knight", "Iron Man", and "Spider-Man II" - all the comic book/superhero movies since that everyone always ranks higher. While I liked all of them, in my mind nothing tops X2. It's one of the few movies I've been really excited about that I thought really delivered in spades.
I was furious at Singer for leaving the X-Men franchise for Superman and even more furious after I saw "X-Men: The Last Stand" and "Superman Returns". The second X-Men movie built on and improved upon "X-Men" in every way possible, and I'm sure his sequel would have done the same. I believe he had the chops to make the epic Phoenix story he alluded to at the end of "X2".
Instead, we got a mediocre third X-Men movie and a mediocre new Superman movie when we should have got a great X-Men movie to round out the trilogy with a bang and either no Superman movie, or a Superman movie crafted by someone else. As someone else once said on another forum I used to read, as perfect as Singer and his screenwriters were for "X2", that's how wrong they were for Superman.