First one was okay, but I don't hold it as highly as some do. I've never been a fan of the gameplay, feels slightly cumbersome. It looks great in gifs, but it doesn't really play as smooth as you'd think looking at those.
Old Blood really let me down, 2 hours long and only the same zombies and village over and over.
Wolf 2 I was pretty unhappy playing it but saw it through to see the story. Boss fights were annoying, level design was crap and got lost a lot, over the top comedy. TNO was more black comedy/ bit serious, Wolf 2 was more wacky, like the whole tone was tongue in cheek and I wasn't a fan.
I never bothered with the others because I was done with its style of gameplay by then. I probably wouldn't play another Wolf unless it was another reboot at this point. I'm done with this New Order timeline.