So let me get this straight. He takes freaking forever to even get started. Marvel changes Avengers plans and references to Pym to make sure they don't conflict with Wright's vision, and he still has the cojones to leave this project? Damn you Wright, damn you to hell!
Yep. Guy comes in, f**** s*** up, then leaves.
All joking aside though, I blame Marvel for this, but for entirely different reasons than everyone else's.
Marvel threw all their eggs in one basket when it came to Hank/Janet. They loved the idea of Wright directing a Marvel film. They made accommodations to their universe to appease his vision, to an extent they haven't done with any other director. They said the Ant-Man film is happening because of Wright, and most here seem to have been more excited over the idea of Wright doing a superhero film than Ant-Man himself.
Whether he asked for an extension or parted due to differences in the vision, that's all irrelevant IMO. It's Marvel's fault for having put so much blind faith in him (and honestly, it's too bad Marvel couldn't be as sincere with some of the other directors that walked). Marvel should have seen this coming long ago.
At this point, is there any reason to continue this project? Things like using Lang and Old Man Pym were entirely part of Wright's vision. There's also nothing stopping Hank and Janet from being in the Avengers or for Hank to create Ultron. Now I'm
not saying they should be shoehorned in Avengers 2 (Dear God, that would be suicidal at this stage), but rather that they made that sacrifice for nothing.
I guess what I'm getting at is it feels like Marvel is just continuing this because they're stuck with it. Which if true will lead to disaster.