I’m not going to argue that they’re bad games or anything, but the only one of those I had even a thimble’s worth of interest in playing was the LOTR coop game, and I can’t see any reason to go back to it in an age when so, so many deeper, richer, more thematic coops exist.
Honestly, the only Knizia I particularly rate (at least, that I know is a Knizia design, he’s all over the place so I might have missed something) is Blue Moon. And even that I wouldn’t probably seek out or play over a bunch of other two player head-to-head games. I realize that the man is very very prolific, but his design sensibilities and what I like about boardgaming are almost completely opposite one another.