I find it amazing they have a great story out of this. I liked the first Karate Kid when I saw it back in 85/86 or whenever it was I watched it, didn't much care for the second but it was decent. The third I hated and was over it by then. I did not start watching Cobra Kai until about a month or so before season 3 started.
I absolutely loved it. I couldn't believe how well it was done and the story it told. The fact that it is on season 4 and will have a season 5 is amazing. Although I wish they would've waited to announce season 5 until after 4 premiered.