The hard thing about these lists as well, especially when we start comparing films that are getting close to 40 years old, is at what point are we really ranking a film by quality and by influence?
I would argue that Superman: TM, while being a very good film, has become VERY dated in many aspects. However, it's huge impact on the comic film genre cannot be denied. But if you start weighing by impact, then Blade or the original X-men film should be very high on the list...though when you look at the quality of those films, while they're both good, I wouldn't put either of them in the top 15 to 20, let alone 10.