Came back to it after many years to see how it has improved. I even bought it (was playing it on a friends account before) because I thought the devs deserved something for their hard work on improving it.
All I can say is that it is not my cup of tea. If you like games with lots of grind and repetition (à la Assassin's Creed) and a sandbox, you will probably enjoy this.
What is lacking is the same thing that is lacking in most indie games (and now days even greedy AAA games) that tries to make a big game by generating all the content in it. It feels like it is missing something. A soul if you will.
For what it is, it is still a very impressive game.

If you have never played the original game: If you don't want to get robbed of the majority of things that made that game great, play the original game before playing this. This game will take some of the greatest setups and payoffs in gaming history and casually through them out as if they were mere curiosities. Things that should be slowly built up and revealed halfway through the original game is basically revealed in what should be equivalent to the first 5% of the original story.

For everyone that did play the original game:: This is for the most part just a bunch of fan service with too much fillers. Nothing even close to trying to recreate what made the original game a master piece. You might get something out of it. But lower your expectations going in. The writing in particular stands out as being extra schizophrenic. It is as if they want to do everything all at once with the original only acting as lose guide rails.