I was pleased with this movie. The animation was mostly excellent (with a few brief moments of really bad animation), the voice acting was superb, especially Victor Garber as Sinestro. The plot was a little over the top, but that's par for the course in a superhero movie.
One thing that prospective buyers should beware is that the digital copy is Windows Media format only. It will not work on iPods or iTunes. I bought the DVD (at a brick and mortar store) and I did read the fine print before buying it. However, I'm sure some iTunes/iPod users may balk at the idea of paying extra for the special edition, which contains an essentially useless (to iPod/iTunes users) digital copy. It seems especially silly since the iTunes ecosystem is much larger than the Windows Media ecosystem.
The special features are also compelling. There's a two-part episode of the Justice League, some documentaries, a first look at the Superman-Batman animated movie, and more.