I played for 60 hours or so, and I enjoyed it a lot. But they put a fatal design flaw into the game by forcing to you be V, and by putting a ticking time bomb in your head. That means that if you play logically, you'll follow the storyline quests in order to fix the big issue rather than spending the time slowly exploring the world they made. It also means that once you beat it, there's no fun in going back and doing it again, because you have to follow the same railroad tracks and go through the same story beats again. It cheapens the experience greatly.
Like you, the world holds no interest for me now that I have found a satisfying ending for V. The least they could have done was put in a "story mode," and a separate "open mode" where you can build any character (who isn't V) and live any life you choose, free from the main quest railroad.
I'll never understand why game designers would make an open world, and then slap on a "YOU HAVE TO SAVE YOUR LIFE HURRY UP!!! railroad quest as the main story. It's a lazy and utterly stupid design choice.
Shawdow194