A lot of people here are complaining for the weirdest reasons. The game is amazing, beating Ghost of Tsushima this year by a long shot for me. I run a fairly Medium rig, which was really high end 5 years ago with a 1080p display and the game runs smoothly at 60 Fps on ULTRA, with occasional fps drops if you run into a crowded street. The story is gripping, the combat intense. Stealth is completly stupid, but so it is in 99% of games and its not more stupid than Skyrim or Ghost of Tsushima, maybe even a little bit better.
I would not recommend it on PS4 or XBOX, get it on the new gen console or A) A ca. 1000 Euro PC with 1080p or B) A 3000+ Euro PC on 4k resolution. The game is not as perfectly optimized as it might be, but then again its also a multi platform release and both the devs and the press warned you several times that its very resource demanding.