Former vive owner here. Beat saber isn't a novelty it is legitimately something to spend dozens of hours on. I'm buying either a frame or a used index specifically for beat saber.

I agree with the other guy. Beat Saber is not a novelty game. It's easy to have short, self-contained experiences with it, but that's not the same thing. It's extremely fun on its own merit and worthy of putting dozens to hundreds to thousands of hours into it. I would also put it at the very top of the "exercise game" genre (see a lot of stuff on the Wii), because of how well it masks being very active behind just being fun and because getting better at the game ties more directly to you physically getting better than just about any other game.

That said, I think it's only a 10/10 game if you're willing to mod it to add custom songs (there's literally hundreds of thousands the community has mapped) and a 6/10 game if you aren't. I haven't bought any of the DLCs, so maybe it's an 8/10 with those. I think the modding is extremely easy, but I also know there are a lot of people not interested in doing that even when it's literally a couple clicks.