I bought it at full price having never played it or hearing much about it. I really like point and click games (Telltale, Lucas Arts, etc).
I enjoyed playing it. It was an easy platinum. The characters were fairly believable and it was fun enough to play. The graphics were so-so, but whatever, I'm not really picky about visual presentations anyway.
The story and dialogue...I'm really torn on. I wanted to know what happened so I kept playing. It just seemed to me like it was written by some 10th grader trying to make an edgy story for their creative writing class. It feels like it tries too hard a lot of the time and something about the exchanges between characters seemed really fake and hollow. I never felt any real connection to the characters despite choosing their fates and learning their stories.
I'd say it's definitely worth $20, even before the extras. Just don't expect it to be game of the year.