It's a great game but a 10/10 may be a bit too much. It has some great writing but there is not much in terms of gameplay and there is a lot of walking around and loading, especially after day 3. There are also several instances of scenarios where, depending on your character, you can leave your game in an unsolvable state without your knowledge, forcing you to revert to earlier saves in order to progress.
The game is also highly political. Many political ideologies are represented (in a weird, fantasy-but-not-really-fantasy way) and usually all of them are given the short end of the stick. More often than not, following any ideology is shown as the bigoted option, while the reasonable standpoint is centrism or lethargy. This didn't resonate well with me, and after a while I found their handling of the subject to lack depth, so it's a wasted opportunity IMHO.
The writing is very good but does not deserve universal praise. It lacks editing (there are quite a few grammar and spelling mistakes) and it very often comes as unnecessarily verbose and self-important. The lore dumps in particular are massive and the game world is both weird and complex. It shines mostly because most other games today have atrocious writing, to be honest, but it is not *that* good.
The marketing message is also misleading. The game is not an open world by any means (in fact, it is constrained to a very small map), and it is in fact fairly linear (there are multiple ways to solve some of the problems, and you can miss a few side quests, but there is not that much in the way of optional paths or scenarios). You have some room to roleplay, but your character and his most recent past is set in stone and that drives a lot of the narrative. In many scenes your freedom is tightly constrained and you are not able to choose some obvious answers anybody in that situation could think of. The RPG nature of the game is divisive. You have character progression alongside many stats and plenty of stat rolls influencing dialogue and action outcomes, but its DNA some times feels closer to an adventure game.
As I said, I think it's a great game, but it didn't resonate to me in the same way Planescape: Torment did. Still worth playing, though.