It is fun and interesting to watch, the story is complicated if you just watch it without fully understanding the events. As long as you're interested and so into the drama, you'll be able to piece everything and conclude what really is happening. Some people say it's not good because there's no background on how Kim Soo became a king but the truth is, there is, I think they're just impatient and didn't really pay full attention to some details that are very crucial to the development of the story. Some complain about the characters because they are 'weird' or whatever, but that's what makes this very interesting, every character has their own unique personality. The story would be boring if they're all too normal right? Overall, this is an amazing kdrama, very interesting, and fun. I highly recommend it.