I feel that the reviews for this boxset need a little balance, due to the amount of people heaping praise and 5 star ratings onto it. Clearly some people wouldn't know bad writing if it slapped them in the face, so here's a more balanced review from a once massive Heroes fan.
For a series that had the most perfect opening season, it does begger belief as to what happened along the way. A show that was heavily character driven, how these abilities affected their lives and how by destiny they were brought together to fight off an effectively written villain.
Season 2 showed a bit of a dip in form, not helped by the abrupt end caused by the writers strike. Many new characters were introduced, many of the storylines were considered boring and very slow.
Season 3, or more particularly, volume 3 "Villains" took all of the complaints from season 2 and threw them off of a bridge. The new characters are mostly unexplored and uninteresting (except Daphne), the comic relief supplied by Hiro and Ando was the biggest, most pointless time waste I've seen in Heroes so far, current characters are largely butchered plot wise (Mohinder being the biggest victim) and I'm not sure even they knew what the hell was going on with Sylar. The writing is just inconsistent and all over the place. They tried to focus more on action this time around but the action wasn't entertaining and the storylines were either irrelevant to the overall plot or just ridiculous. The second half of the season, volume 4 "Fugitives", was a fair improvement as they at least attempted to undo some of the mistakes left by volume 3 and the story had a direction to follow, which it actually stuck to.
So even though I own seasons 1 and 2 on blu-ray, I think I'll skip this one until it is bargain bin price due to it's sheer lack of quality. I cannot see myself re-watching volume 3 and therefore would only be buying for the sake of my collection. I think Heroes will forever go down as one of the biggest disasters in TV show history.