I would definitely say it was worth it because I am a huge fan of the show and I think that is the critical factor. If you arn't a fan or never really watched it it is just a funny, polished RPG that is a little short. If you are a fan it is so rewarding and you are constantly gawking at all the refrences it makes. I summed up how I felt (although I tended to go on a little to long) about how I felt at the end of the lets play I did. Here is the link to the exact reaction just don't click earlier to see the ending:
Start at 16:49
I hope that helps! $60 is a lot though.