Give the keys back to Edgar Wright and let him direct his screenplay that he and Joe Cornish worked on for years.

Marvel can afford to let an auteur display his vision. By the time Avengers 2 has smashed the box office people will pretty much go and see anything in the MCU - in fact GotG will probably be a huge hit too and that seems to have a very quirky humour.

Is the summer 2015 release date so important to Marvel, its still shocking that with less than a week/month before shooting began they replace the screenplay and director.