The plot for this episode is actually quite interesting. It breaks away from the regular ol' setting quite well. I think it's pretty interesting to have an episode where SpongeBob is miraculously great at something ironically. The whole concept of SpongeBob being mistaken as a doctor is something that I felt at first wouldn't really work well. It's been done before in really great ways (Drake & Josh, The Fairly OddParents, etc.), but unlike those episodes, SpongeBob actually takes what he's doing seriously (Only in reality, he has no idea how to properly treat his patients), and manages to succeed. The ironic humor of this concept is chuckle worthy, but there are peculiar situations SpongeBob gets into, that makes you wonder :confused: "Will SpongeBob fail, and be exposed as a fake?", but he ends up miraculously overcoming the patient's issues. That's a key thing to the plot. You keep questioning yourself when SpongeBob messes up, but he manages to surprise you and come out on top (Even during suspenseful moments like the moment with him & Mrs. Puff). Aside from that, this episode isn't exactly the best when it comes to comedy. Sure, there are some funny jokes (Like SpongeBob's quips while operating on Squidward, as well as the instant transition to Squidward's room having a makeover), but there's not too many of them. Some of them aren't too good, like the gags with SpongeBob chopping up Squidward's body (Seriously, that one with the sandwich is disgusting, just as awful as the infamous view of Patty in To Love a Patty), while others are pretty funny (Like how SpongeBob compared the bottom feeder to Patrick). A lot of the jokes seem to fail, and don't really work that well. There may be a few good ones here or there, but hardly any.
What I really like is how things tied together with SpongeBob & Squidward. By then, I forgot about Squidward's subplot, so it was nice to see that the main setup for the episode returned by the end. There a lot of issues with this scene, regardless. As I mentioned before, I really dislike the gags with SpongeBob chopping up Squidward. I thought they were repetitive, and annoying. There were some funny gags though (Like the one with the doctor not being able to see), but for the most part, the operation jokes were pretty bad. I did like the montage of Squidward's different noses though.
So ultimately, this episode's main pro has to do with its plot. The concept is interesting, and the execution of it was very well done, and entertaining. :clapping:
While the jokes on the other hand...

...yeah...they weren't that good
All in all, I give this a 7/10. It's a
Good Episode. Probably one of the best plots of the Season, but the jokes are definitely a problem in this episode, either being not too funny, or just not funny at all.