I'd consider Spider-Man and X2 to be two of the greatest movies ever made for many reasons, and probably better than Superman: The Movie and Batman(also two of the greatest movies ever).
Spider-Man 2 and X-Men 2 are so far away from being in my favourite movies ever, it's not even funny. Spider-Man 2 is a sad rehash of the first film and X-Men 2 is just an action-packed road-trip movie that lacks the emotional punch the first (and the third, even though it probably wasn't as good) had.
The problem with DC's argument is that although they've had some great Superman and Batman films in the past, in "the new generation" of superhero movies(which Marvel started), they've had two films total, one of which was brilliant and the other a sad mess that didn't even make enough money to guarantee a sequel, let alone guarantee one three days after it hits theaters which Marvel's been able to pull off half a dozen times.
At the very least, Superman Returns tried to enhance and further the genre from just being slam bang action, a film-making style to which every last damn Marvel movie (with the exception of X-Men 1) has prostituted itself.
There may be more Marvel movies, but it still doesn't change the fact that a handful of DC movies have had better reactions from people than any of the Marvel movies. I've met more than ten people who've listed V For Vendetta and Batman Begins as two of their favourite films and every time I've watched either film with anyone, they were always completely speechless at the end.
I'll admit that Superman and Batman 1989 are slightly dated to today's audiences, but I've never met anyone who didn't enjoy either more than stuff like Spider-Man.
However, whenever I watch
any of the Marvel movies with anyone, it's either "Well that sucked," or "That was fun. Let's get something to eat."
Marvel's had at least 7 great, widely acclaimed and successful films so far and they've still got the untapped well of Iron Man sequels and Captain America/The Avengers. DC has Batman, Superman(if they can get their **** back together, only took them about two decades last time), and the shakey possibility of a Justice League movie and maybe the Flash. After that.... what? Does anybody really still expect a three-film long Wonder Woman or Green Lantern franchise to happen?
Green Lantern (if it happens) has just as much chance of being as good as Iron Man was. Plus, DC have a ton of back catalogue characters they could make into movies.
In this 'era' of superhero movies, Marvel is producing more films at a more consistent rate, but there's nothing to say that DC won't bounce back and make a ton of movies. And even if they don't and they continue to make two or three movies every decade, I couldn't care less because they've proven that their business is in making
great films and not fun comic book movies.