Is Sekiro worth $15?

I have never played this game before, but my friend sells it for $15 on Xbox. It's the normal version, not GOTY (I have no idea if there is a difference or if they are the same game, or should I only buy the one that says GOTY), but is that a good deal? Or does it get cheaper on Steam/Xbox sale?

I have looked up gameplay, and it looks pretty fun, but I am not sure if it gets boring or if it has any massive issues that I didn't see in the online gameplay.

Edit: I ended up picking it up a few days ago. I have not stopped playing the game! I currently have about 17 hours, and that's crazy for me. It's honestly my favorite From Software game in terms of second-to-second gameplay (which is saying A LOT). I greatly appreciate everyone giving their 2 cents on this post, as they helped me decide to pick up the game. Can't wait for my second playthrough even though my first one isin't even done yet!