This is a well-written story about the next generation of Avengers. The animation is good, similar to Iron Man (animated). It is a great movie for kids and adult super-hero fans alike. I don't know how much difference there is between the Blu-ray and regular DVD versions, but I rated the movie on its own merits and not a comparison.
What's great about it: Story line, animation
What's not so great: Not a whole lot in the DVD extras