The X-Men: First Class actor told Sky News that UK producers are too preoccupied with pitching projects towards an American market, but ultimately result in "patronising" the audience.
He explained: "We dumb our movies down because we want Americans to understand them.
"The Americans watch it and go, 'this is a really unsophisticated dumbed down movie. Why would we want this? Why do we like this? We don't'."
McAvoy added: "It's like we're patronising them and short changing ourselves."
However, the star said that Tom Hooper's success with The King's Speech is proof that intelligent, spirited British films can be embraced by the US market.
"I think the whole thing is to keep trying to make the best possible movie that you can and hopefully the cream rises to the top," McAvoy stated.
The 32-year-old, who is expected to sign up for thriller Welcome to the Punch, recently revealed that he is rarely spotted when walking in the street.