I mean, come on. Kobra ******* Kai is not some deep, profound complex show or nothing. A handful of episodes is more than enough to get a feel for what kind of show it is.
I'm not claiming it as great, high brow TV; but...
You've watched 5(ish) episodes out of 50
By Star Wars equivalence (so about 2 hours in), they're just starting the first trench run on the Death Star.
By LOTR (EE) equivalence (so about 70 minutes in), they're just leaving Bree with Aragorn.
By Harry Potter equivalence (so about 2 hours in), they've just got back from the forbidden forest where Quirrell / LV was drinking unicorn blood.
Anyone expounding on those franchises having left at those points, doesn't know what they're talking about yet; beyond "I didn't like it" (which is entirely fair and valid)
And come on, talking about a lack of character development, having seen half of 1 season...
If you're comparing to the films - then, it shows you weren't actually watching those 5 episodes (maybe on in the background); and if you're comparing within the season, shows that you weren't paying too much attention to the season, AND left before you could viably expect anything in the way of character development.