'Ant-Man' is James Gunn's favourite Marvel film since 2008's 'Iron Man'.

The 44-year-old director - who helmed the 2014 movie 'Guardians of the Galaxy' - has given his verdict on the latest Marvel release, saying it's the best the studio has produced in years.

Writing on Facebook, James said: '''Ant-Man' may just be my favorite Marvel film since Jon Favreau's Iron Man (well, maybe excluding one film to which I'm partial).

''Honestly, the movie is a complete blast! I was so happy after seeing it. It's never boring for a second and it's hilarious and warm throughout.

''It doesn't get caught up in the webbing of its own science-fiction concept like so many movies do these days, remaining simple and elegant. It's a part of the Marvel universe without being ruled by that fact. (sic)''

James was also effusive in his praise of 'Ant-Man' director Peyton Reed, saying he did ''an incredible job''.

He explained: ''I think all of Peyton Reed's years directing have led him to making something as deft and nimble and joyous as this; he did an incredible job.

''And, despite Edgar Wright's parting from Marvel, his spirit is felt through the entire project, and there is no doubt everyone owes him a huge debt of gratitude.''