I'm not really the type to really take much issue with performance and graphics, so while I was able to look past a lot of those issues while playing, I definitely do think the game could have benefited from a bit more development and optimization time before release.
The bones are there though, the gameplay is a lot more engaging than walking around in grass waiting for random encounters, or waiting for a model to just pop up in the overworld like Let's Go or BDSP. It's a huge step forward in terms of making the Pokemon feel like they actually exist in the world and you interacting with them, not just products of random chance. Worth noting that I'm biased in that experience is my favorite part of Pokemon games - the battling is not significantly better, the gym challenges feel like fluff, and while the story is better than the last few generations, I really think Pokemon needs to move on from the format of "you're a small child who trips into this world-saving adventure" sort of story.
Nonetheless it's easy enough to ignore most of that, and I still had a fun time catching all the Pokemon, doing raids, etc. and I look forward to them hopefully improving the experience and releasing DLC