Hey- the Adventures of Pete and Pete was an awesome show! That being said, I seriously doubt it deserved to be in the top 50 of all time.
Anyway, I don't agree with a lot on that list. However, they did get a lot of shows right, inasmuch as they were on the list somewhere. I'm glad to see Battlestar Galactica so high, as it truly deserves it, along with Firefly, Mystery Science Theater 3000, Quantum Leap, the X-Files, and 24. Personally, I would put 24 at the top of any best-of list, but that's just my personal preference.
However, they got a lot of things wrong. The fact that The Wire is up there shows that they know HBO exists- so where's The Sopranos? Where's Rome, which is quite possibly the greatest show of all freaking time? And come on- Buffy was very good for what it was, but it is no where near the level of the shows I just mentioned.
So, all in all, a pretty crappy list. That's not saying it's not a valid representation of someone's opinion, mind you- it's just not a valid representation of mine.