The quality of the mixtapes is stellar, and as far as I've been seeing, people generally agree that his latest is his best, or one of the best.
And if his debut album is seen as a "disappointment", it isn't because of quality, but mostly subject matter. It was hard to top albums so good like KRIT Wuz Here, R4 and 4Eva anyway.
King Remembered in Time showed KRIT's growth as a producer and lyricist. Tracks like Banana Clip Theory, WTF and Bigger Picture are fantastic concept songs and the production in stuff like King Without a Crown or Multi Till The Sun Die is in another level.
He's not limited as an artist, lmao. He is extremely well balanced: Has bangers, has concept songs, has mellow songs, has deep, introspective songs, etc.
An example: 5 different songs, from the same album, all produced by him:
http://www.youtube.com/watch?v=6cy8T_aHnWo
http://www.youtube.com/watch?v=ymf3ja_XW9c
http://www.youtube.com/watch?v=5s_WsF7L_nA
http://www.youtube.com/watch?v=6i9d-AEvRWs
http://www.youtube.com/watch?v=-ieLm5gmhU0
With variety like this, how can he be considered "limited"?
So yeah, he really is the best among the other cats.