Call it bad parenting, but I took four of my children to see Spider-Man 3 today. One got in for free. Three carried blankets with them in case it got too scary (none were used). One had to use the bathroom in the middle of the movie. One, the one who got in free, was tired and wanted to go home before the movie was over. (Fortunately, I was able to bribe him with a small Sprite - if a three-dollar drink can be considered small.)
The kids know these movies and wanted badly to see the new one. Though not as badly as their daddy. I have been a huge Spider-Man fan since, well, always. I have at least two school pictures taken in Spider-Man shirts.
The newest of the Spider-Man movies has some great redemptive moments, some moralizing (a little overt for the little ones), as well as some flaws. The flaws mostly arise from packing in too much to possibly develop. But it's still good. It's darker. And it's got Spider-Man in it.
Go see it. Take your kids. Stay up all night with them as they have nightmares. Now that's fun for the whole family.