Once I got this game on release day I couldn't stop playing it for any reasons other than required biological functions. I was hooked from beginning to end and then even further once the main story had concluded. Any concerns I had about bang for my buck were unfounded and I'm loving my time with the game even after 24+ hours of play.
Like the N64 original, the game revolves around taking photos of Pokemon in their natural habitats. While the original took maybe 4-5 hours to 100%, this game offers far more content and has a main story that's going to take 8-10 hours from my experience. Once the main story is over, you can go ahead and continue playing to advance your rank on existing stages, find new routes those stages, and fill your "Photodex" with Pokemon that weren't present prior to the story's conclusion. While I'm on 24 hours of play now, I still haven't found every Pokemon and have a good few stages left to attain max ranking on, not to mention completing requests and filling out my Photodex with four different star ranked photos for each Pokemon in the game. If you're a completionist, you're going to get a lot of time out of this game.
It should also be mentioned that the game doesn't spell everything out for you. While you can easily complete the story without too much trouble, getting certain sequences to trigger can be a real puzzle. Be prepared to try absolutely every item at your disposal in various ways to get some of the better photo opportunities; they're not all super obvious. It definitely keeps you on your feet.
In terms of visuals, the game is beyond any Pokemon game that has been put out to date. It's colourful and very pleasing to the eyes, which is very helpful when the goal is to take pretty photos. The music is very pleasant to listen to and the course-based structure of the game lends itself very well to the "just one more run" mentality. Performance-wise, the game is almost flawless. I experienced some brief slowdown when a Wailord emerged from the ocean directly in front of me, splashing particle effects all over the screen, but that was it, everything else was buttery smooth.
I highly recommend New Pokemon Snap to any Pokemon fan who is just happy to take it easy for a while and snap some pretty pictures. I'm certainly enjoying it a whole lot.