On the topic of underrated series and also ones that got cancelled on a cliff hanger....Odyssey 5.
Really enjoyed it and had been hoping for a Firefly-esque movie follow-up, but sadly looks like it'll never be concluded.
I enjoyed Jericho, the acting/directing was a bit shoddy in places but it was a good show. I heard Netflix are looking into picking it back up!
I always loved Ed
Amazing and funny cast, great cameos, sterling soundtrack and stories that always left me feeling just a little bit happier afterwards despite my late teenage angst.
Launched (or not?) the careers of some very well known talent including Justin Long and Julie Bowen.
Many more of the cast I really wish were given more opportunities. Particularly Tom Cavanagh the eponymous Ed and Michael Ian Black as a bowling ally employee.
Glad to see there is a bit of love for Trailer Park Boys. Psych is another good shout. I'm not sure how popular it is in the US but no one over here ever mentions it yet its one of my favourite shows.
I thought Caprica, prequel to Battle Star Gallactica, was one of the best Sci-Fi shows ever!