After careful consideration (and by "careful consideration" I mean I thought about it for all of two seconds), here is my (very tentative) list of the best shows ever:
10. Monk- The mysteries aren't as good as they used to be, but who cares? Tony Shalhoub is still hilarious, and deserves every Emmy he gets for his outsanding performance.
9. Lost- This used to be higher. Then the third season happened, and it dropped below the top ten. Then the finale happened, and it came back up. I wish this show would just make up its mind.
8. Avatar: The Last Airbender- In a word: awesome. I love this show; the acting, action, and animation are all better than anything else on Nick now. It definitely harkens back to a day when Nick was actually, you know, good.
7. Quantum Leap- If you haven't seen this show, you need to. It proved that you don't need massive amounts of special effects and an insanely episodic story to tell great Sci-Fi.
6. Supernatural- The first season was pretty scary. The second wasn't as bad, but made up for it with a grittier feel and a finale in which the gates of Hell were literally opened.
5. Battlestar Galactica (New Series)- It's frakking awesome! Not only are the stories a perfect allegory for the situation in the world right now, but the acting and special effects are top notch.
4. Invader Zim- The greatest cartoon of all time. You will not argue. It is fact.
3. Rome- I have only seen the first season (still awaiting the second season on DVD), and it literally practically perfect in every way. Really, the only thing I had a problem with was the incest and lesbian sex.
2. Firefly- I have little doubt that, had this continued beyond fifteen freaking episodes and had been shown in order upon first airing and hadn't had the time slot screwed around with and hadn't been cancelled because of the stupid execs at Fox whom I hate hate hate with a passion, it would have vied with 24 for the top spot.
1. 24- Quite simply put: spectacular.