In my opinion the top three underrated shows are:

Arrested Development: This show was absolutely brilliant! Great humour, unique premise, amazing cast - just brilliant.

Veronica Mars: Definitely a "Better than it sounds" (tvtropes.org/pmwiki/pmwiki.php/Main/BetterThanItSounds)show - the writing on the show is perfection.

Futurama: This show is HILARIOUS!!! All the characters are money on this show.

Honourable Mentions: Buffy the Vampire Slayer, Scrubs

1. Veronica Mars - If you know me, you know I'm a fanatic, and I REALLY think it deserves way more attention then it got.

2. Freaks & Geeks - With a slight cult following, this comes in at #2 because I love it so much. The saddest part is that after a taste of 18 eps it was canceled.

3. My Name Is Earl - Being fairly popular, I still think it deserves more attention then it has because it makes me laugh so hard while trying so little.

Scrubs - it's genius, but a lot of people hate it.

Ugly Betty - no one seems to be watching it, which is a shame, as it's great!

Life - VERY underrated, ask anyone- most have never heard of it.

1. Being Human- seriously anyone who loves the vampire/werewolf genre NEEDS TO SEE THIS.

2. Friday Night Lights- Amazing! thats all I can say.

3. Battlestar Galactica- whoever writes this off as another cheesy Scifi space opera would be in for a giant shock. It was one of the best acted and written scifi shows of all time.

1. The 4400
2. Veronica Mars
3. Ugly Betty

I would definately say veronica Mars. Not sure what my other two are, but I am still in disbelief the CW cancelled such an amazing show.