Hero is on DVD. It's a pretty mediocre quality one though. Even though it's a dual-layer disc, it's only 7 GB including the extras. Why it's not 8.5 GB I don't know, because the video quality really could have used the extra space. Plus, the menu, the movie intro explanation, and the extras are only in Chinese.
I think the movie was pretty good, but had its problems. The music really was lame, and the pacing needs work. To be honest if Miramax cuts out some of the slower scenes and it works, I wouldn't protest.