Alright Wizardry 7. I hope you have played Wizardry 6 before thinking playing this Game. ;-)
This may have the better graphics and the sound is pretty amazing here, but rust me, play Wizardry 6 before or don't play this series at all.
You ask why?
Well it's pretty simple while Wizardry 6 is hard as hell, I feel it's still waaaaay easier than this one. Additionally if you finish Wizardry 6 you can import your Party winto W7 and continue in this adventure.
Generally the Wizardry Series tend to be much harder than other dungeon crawler games, even the older ones, so if you're new to the genre, I really suggest you try Lands of Lore 1 and then Eye of the Beholder first.
Alright, let's talk about W7.
The game is highly complex with a ton of spells, most of them useful in at least some scenarios. There are plenty of riddles in this game, a lot of them also requires to carefully read and note basically everything. A lot of information may just appear dead, but at some point, you need it.
The battles are sometimes tough and sometimes really easy. You can adjust the difficulty in some kind, that if the game gets too difficult you can change the classes of your party, which makes a lot of encounters trivial. But it may require some grinding at some point, altough I think you can make it through without senseless grinding. There are plenty of random encounters anyway.
The much harder thing in this game are the riddles and "quests". Did I mention that you don't have a quest book? Well you don't have one. The good thing is: You have a minimap. Well kind of. You have to raise the card drawing skill first and even then, it's not a full minimap.
The riddles and dungeon mechanics are so hard that I think if you play this game the first time without consultating a walkthrough you probably end up with 750 - 1000h of gameplay.
The game content is about 3 times as big as in Wizardry 6 and the map is huge. Additionally there are plenty of dungeons and they have some of the most annoying mechanics I've ever seen, which requires some map drawings even if you have the minimap.
I really suggest this game to anyone who likes dungeon crawling games and is looking for a real challenge. This is as hard as it can get.