I'd like to see it on bluray selling on Amazon too (and think it's more than worthy of that), but from my understanding it was made as part of a deal with Target, hence it only (at least for now) sells at Target.
It deserves more exposure, and I might have been inclined to assume it was bad as well based on it's limited release, but not after seeing reviews and/or viewer polls, and I wouldn't have definitively decided it was terrible without either seeing it myself or at least taking into account the impressions of people who had actually seen it. If that makes sense.
No one's life will be changed by seeing or not seeing it, but if you're a fan of superhero animation, there's a pretty good chance you'd enjoy it. I like the more adult stuff more, but liked this quite a bit as well (far more than any of the Marvel all ages stuff currently being done).