Not much Wizardry 1-5 in this thread (from what I skimmed)
I mostly can't get into Wiz 1,2,3,5 because what drew me into the series was complex builds and character development, which 6 to 8 has but the complexity wasn't quite there yet by the time 5 rolled around.
I guess for a "historical purpose" thing they might be worth playing.
Come to think of it, is it really liking a series if you only like 1/3 of it? Ah well, whatever.
Also whenever the Japanese game makes a Wiz clone, it's almost always based off 3/5 with bells and whistles, so I never felt the need to play them since it's pretty over-saturated in that regards... yeah yeah, feel free to burn the heretic.
Now, Wiz 4 is special, very very special and stands out against the rest of the series. First off, it has a different concept: instead of creating and playing a group of heroes, you play as the villain from the 1st game who summons monsters to do his bidding way before games like Pokemon even came into existence.
That's the interesting part, so what do I think is bad? Well, I think it's less of a dungeon crawler and more of a puzzle game trapped in an RPG engine. Not the fun kind of puzzle games but the kind which makes you wonder exactly what mental problems the creators were suffering from which some people claim is what put the puzzle game genre into a comatose state for a while because it takes a RIDICULOUSLY specific subset of knowledge that most of its players are not very likely to have in order to complete... and this was before the popularity of the internet!
Not only do you need a ridiculous in-depth knowledge of obscure parts of Wizardry Lore and mechanics, you also need to have very through knowledge of religious mythology to "get" Wiz 4. Most people get stuck in the first room of the game.
I mean, on a design level, I suppose there's some merit in a game where the game isn't "hard" because the authors are terrible at game design or balancing mistakes. Instead every thing in Wiz 4 is specifically designed to kick you in the balls and maybe some people might enjoy that but I don't really think it's a "fun" game.
It's an "intellectual curiosity" game to me.