I think the main reason K was so bad was because of all it had to work with. Near perfect art, mesmerizing ost, great plot to start with, yet they still somehow found a way to trash it. For one, the main character was the least interesting person on the show. In fact his group was the least interesting group in the show. 2 of the 3 or 4 best episodes we're episodes they were absent in. Second, the fight scenes were a total let down, mainly full of colorful power-ups and unexplained abilities.
That leads us to the third point: Project K explains 35.678% of the storyline and motives behind nearly all the characters. No one knows how a Kings are chosen, what is the extent of their powers, why certain characters are the way they are, nothing.
Summary: K is like a legendary warrior, wielding a legendary blade, during a legendary war, and somehow he still can't manage to save the day. If you are new to anime, by all means, watch it. But if you're a seasoned anime watcher, and need more than cliches in your life, watch the first episode and walk away. Finish the story in your mind, what ever you think about, i'm sure it will be better than what the creators wrote
