I'd say they did the best they could given the circumstances, the new cast gave it their all and the writers did what they could to make things familiar yet fresh. It was a noble experiment, but a post script season with a new cast (and thus a different dynamic) is a tough sell for any successful series.
Denise was great as a recurring character during the eighth season, with some really good one liners and a couple of good serious moments as well. As a main character though, I didn't they think they did a good enough job fleshing her out. It was basically one joke, one theme (her being a tomboy) done again and again and turned up to eleven. It was also weird having her go straight from being an intern to an attending and in a position of power. From memory, we're supposed to assume some time has passed between Season 8 and 9/Med School but it felt like they missed a few steps in character development.
Honestly, if a post script season had to happen, I'd have set it right after Season 8. JD's taken a new job so you could have Zach Braff making his six or seven appearances, along with Sarah Chalke. They finished Season 8 as a couple, so her pregnancy (and therefore Elliot's) could've been written in pretty much the same. You could even set it a little further into the future (but not quite as far as they did) if you wanted to have them married as they were in Season 9, or you could've just had them engaged. You'd still have Turk as the Chief Surgeon and Cox as the Chief of Medicine, Carla could still be at home with the two kids (and mentioned in passing when need be) since Judy Reyes didn't sign on for the new season. Other members of the original cast could make their appearances and Neil Flynn could still be written out the same way.
You could then shift focus slightly from the main characters to the interns introduced in Season 8, including Denise. I felt they were a more likeable bunch and there'd be more potential to make a "familiar but fresh" approach work. There's no skipped steps with characterisation or the jolt of a newbie suddenly being in a position of power.
As for the narration they could just keep JD, even for episodes he didn't appear in. I'd liken it to Future!Ted in How I Met Your Mother or perhaps Ron Howard's role as the narrator in Arrested Development. From an in-universe perspective, one could explain it by suggesting that he's recounting a tale second hand, events that Turk or someone else told him about. They did a couple of episodes in Season 8 without his narration which worked out alright, so they could probably drop it at times or completely if they were feeling a bit more daring.
Anyway, I feel that would've made a much better post script season. It probably still wouldn't have been quite up to scratch but I think I'd have enjoyed that more.
Lamrock wrote:Scrubs: Medical School (or whatever it was called - not season 9) was watchable in that it was still Scrubs, but it obviously wasn't very good. I still disagree about Cole though. Annoying and not very likable, sure, but he was also the only character that brought the occasional lulz.
What exactly was funny about him though? For me there's nothing inherently funny about being annoying or a jerk, a trap I feel a lot of comedies fall into these days (I guess there's a fair few people who do find that appealing but I'm definitely not one of them). When you have a fundamentally unlikeable character, the way to make them funny is to have them be witty, get them into comedic mishaps and in most cases, have them screwed over by the situation when it's all said and done. I'm sure I've mentioned it before but if anyone here is familiar with the Blackadder series, the titular character is a perfect example of what I'm talking about.