The first reviews of 'X-Men: First Class' are popping up and they're all raves, with director Matthew Vaughn and stars James McAvoy, Michael Fassbender and Jennifer Lawrence all being singled out for praise.

After the disappointments of 'X-Men: The Last Stand' and 'X-Men Origins: Wolverine,' fan sites are ecstatic to see the series return to form. "It's a huge home run," says Collider, while others rave about its exceeding the usual comic-book movie expectations.

"'X-Men: First Class' is a genuinely good movie, not just a good superhero movie,'" writes the Hitfix reviewer, who says it's his favorite film in the entire series.