Combining star Bradley Cooper's A-list appeal with director Clint Eastwood's gravitas, American Sniper has become a surprise box office smash across the pond.

But not everyone has been bowled over by the movie, which tells the true story of Chris Kyle, the most deadly sniper in US military history.

American Sniper kind of reminds me of the movie that's showing in the third act of Inglorious Basterds. — Seth Rogen (@Sethrogen) January 18, 2015

Seth Rogen took to Twitter to share his response to the film, writing: "American Sniper kind of reminds me of the movie that's showing in the third act of Inglourious Basterds."

He is referring to a Nazi propaganda film entitled "Nation's Pride" which is being screened in the cinema in the Quentin Tarantino movie's blood-soaked finale.

However Rogen later clarified his comment.

"I wasn't comparing the two," he insisted. "Big difference between comparing and reminding. Apples remind me of oranges. Can't compare them, though."

Documentary filmmaker Michael Moore, noted for his left-wing leanings and anti-gun sentiments, has also been a voice of dissent over the film.

He tweeted: "We were taught snipers were cowards. Will shoot u in the back. Snipers aren't heroes. And invaders r worse."

Currently topping the US box office, the film is up for Best Picture and Best Adapted Screenplay at the Oscars.