Minor spoilers:
I disagree about the exploration. I did a lot of exploration to find all the voxaphones or whatever they are called. I feel like there was more than enough reason for you to explore.
I agree about the vigors they were really easy to get and cheap but still you were practically the only one that used them, that didn't make sense.
About the plotholes, every game that has some sort of time travel is bound to have plotholes. I don't remember ever playing a game or watching a movie about time travel and not finding plotholes.
Overall, I really enjoyed the game. I didn't think it was that short, it could have been longer, but it was not short. It took me a decent 15 hours on hard and a bit of exploration. And the story although it has plotholes made me think and it wasn't predictable. The whole atmosphere in the game was amazing and the story telling was great. There weren't many bosses yes but there were mini bosses. And about the ghost fight it wasn't "cheap" in my opinion it just needed some strategy. I managed to beat it without dying once. I give the game a 9 or a 9.5.
