Michael Douglas is a fantastic actor though. You get him into a movie like this, not only does buzz shoot up for your project, but it also opens up your doors to other actors who may never have considered playing a superhero before.
This franchise has PLENTY of other younger actors around to kick butt. ScarJo, ATJ, Elizabeth Olsen, Hemsworth, Hiddleston, Evans, Smulders. There should be a good balance of ages, genders, races. They're working on the last two, but casting Douglas gives Ant-Man a whole new gravitas that people are talking about. I mean, yesterday Hank Pym, Scott Lang, Paul Rudd, Ant-Man and Michael Douglas all trended on Twitter worldwide throughout the day because of the announcement.
Also, I really don't know how you can call it a stupid movie when we haven't seen any footage of it yet, and the dude making it routinely ends up on everyone's best of list. Wright's a pop culture visionary as far as I'm concerned.