Some movies, like "One Flew Over The Cuckoo's Nest", depend on great acting to draw people into the theaters
Others, on a great story, like "Schindler's List".
Some, like "Hugo, on a tug of the heartstrings.
And some, like these under discussion here, don't really have those attributes to fall back on. They generally depend on bright colors, lots of action, glitzy special effects, and loud explosions to keep the general public in their seats munching popcorn.
That's not to appear snobbish and dismiss the genre as bad or low class. It's not. It's actually quite fun.
I'm just trying to define it.