Early reviews have started landing for this week's big blockbuster release Justice League - and it sounds like fans are in for a "fun" but "messy" adventure.

Zack Snyder's new superhero caper features an all-superhero cast of Batman, Wonder Woman, Aqua Man, Cyborg and The Flash, as well as a rumoured appearance by SuperMan.

Many believe the film will struggle to cut through when up against Taika Waititi's dominating superhero saga Thor: Ragnarok.

Snyder has a patchy history, with his last film, Batman v Superman: Dawn of Justice, doing well at the box office but scoring just a 27 per cent rating on Rotten Tomatoes.

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Full reviews won't start coming in until after the embargo lifts overnight.

But that hasn't stopped some critics from posting their initial thoughts on Twitter - and there seems to be consensus that while the film's CGI villain isn't great and the plot is messy, it's still a funny film.

Read a selection of them below.

Justice League hits cinemas on Thursday.