Although many people liked this show, there are many viewers who didn't watch it because they were afraid of the bad reviews. I have nothing bad to say about "Dear Doctor". It all fits together so well and I really felt inside the universe when I was watching this for the first time. You won't regret anything. Sure, the story felt slow at times, but I think it suits the plot anyway.
Another good thing to say is about the storyline behind the characters. There wasn't any moment, when I was watching, that I didn't feel the emotion from that. Everyone that watched it will know what I'm talking about.
By the way, no matters what people say, I'll be in love this serie for a long time and I'm sure you'll like it as I did.