FZ became a "great" anime for me after I saw latter episodes of it as well. Either way, KnK has been an enjoyable ride for me. Things haven't really come together as of now in terms of plot and stuff but yet but people say it'll happen when I watch movie 5 and seven.
For now, just going on with whatever it throws at me and looking at the great action + soundtrack and having fun.
Yeah, I heard it had great animation and music. But people generally praised the plot online. They were of the opinion that this is like the dark souls of anime - it rewards you with patience. Everybody said it got boring in a few places but everything ultimately falls into place nicely.
Either way, I'll give it a shot sometime. Also, holy crap lappy, you've seen so many anime. How many years have you been watching anime?