^
Concerning the low points: Just out of curiosity, which seasons (or episodes, if there are ones that particularly stand out) are generally considered to be weaker and why?
I can only speak for myself and my opinion probably doesn't fit with the majority's, but I've never been a fan of season 5.
I think the show was in its prime in season 1-3, they had a good balance of comedy and drama and the show seemed to have a sense of purpose. Season 3 is my favourite because there's a great arc involving JD/Elliot while the whole thing builds up to Turk and Carla's wedding, and it had some of the best guest characters such as Dr Casey, Danni and Sean. Actually, I never noticed how much I missed Sean until he showed up at the end, I think he was the perfect straight-man to JD's buffoonery.
Season 4 started out well ("Tuuuuuuuurk!!!" "JD!!!!"

) but it felt directionless and floundered towards the end. Season 5 never worked well for me because I felt the balance went far too much toward zany humour. There's some great episodes such as My Jiggly Ball and My Lunch, but my biggest problem was that JD became a background character for most of the year, and as the leading man he really needed an arc.
That's why I'm one of the few who loves season 6, JD was put at the centre of the show again, and there was a similar feeling as the third season in that they were building towards something. I think the final third of the season was gold. I thought season 7 was okay when I first saw it, but I rewatched it on DVD when it came out and it isn't as good as I remembered. The fact that the season was cut short due to the writers trike didn't help, and the second half of the season was bad because Bill Lawrence wasn't on set guiding things as he usually was.
The final season was good, the best since season 3. There was a few duds along the way, but there was an overall arc and some classic episodes, and the finale was a good send-off.
Best episode: My Screw Up
Worst episode: Anything involving Mrs Wilk (season 5). Gods, I hated her.
Sorry, I didn't mean this to be so long, this tends to happen when I talk about Scrubs.
