The game is 100% awesome. I played it for the first time last year - got it on a GOG sale and the reason was more or less "It's made by Troika", since I wanted to see more stuff they've done, and "you can disintegrate doors" which somebod mentioned somewhere as a possibility for the player to use magic to influence the world. Yeah, that's it really.
So I got Arcanum on GOG, decided to boot it up just to see what is it about and immediately fell in love with it - you can friggin' raise the souls of corpses to answer your questions. Yeah, that's a thing too - this means that if somebody wants you to do some quest for them in order to give you some information, you can just off them and extract the information from their ghost. It's really cool.
The world itself is well done, too - you get ogres on airplanes from the very get-go, then steam trains, robots and stuff that mingle with necromancers and sorcerers.
The story is engaging and not without some twists. I'll mention some without spoiling much - you are called "the chosen one" from the first minute of the game - a title you can embrace or throughout the game claim to be wrong. It's actually really funny - there are some random encounters with bandits that go something like this "So, you're the chosen one, eh?" and you can just tell them "Yes" or "I'll kill you" which results in a fight, or you can say "No, you're mistaken" and they just leave you alone. Other than that, you can just join the dark side about...I think 2/3 or 3/4 of the game. And in the end, regardless of choice of side, you can chat with the big bad. Who is actually reasonable as he explains why he wants to wipe the world. And it makes sense. Though with high enough persuasion, you can talk him out of it and...that's that - you win.
I really love the type of choices you can do. I really love the world, too. I love the game - when I played it, it immediately became one of my favourite games ever.