I don't really get what you're talking about. Maybe it's just a difference in values. If I was going to watch something that was bad I would value it more if it strived for originality, even if it floundered along the way.
Phantom World utilizes its open ended nature and light-hearted tone to play with concepts and visual imagery. It obviously remains self-serious to a point, but its path for getting there does wind and twist. KnK confronts its monster battles head on, with the only path being people flipping around trying to look cool while fighting demons. Phantom World doesn't have that same air of pretentiousness. It's goofing around the whole time while it's trying to deliver its character stories and establish the cast. Confronting problematic spirits in Phantom World usually doesn't boil down to the characters simply squaring off against an enemy. The only time KnK ever got to a place like that was in its idol episode.
If the action and serious character interactions of KnK held more value to you than the over the top playfulness of PW I would understand, but it's hard to really categorize KnK as a show that was "entertaining".