Great game for fans of the series and especially for those who had Pokemon Yellow back in the day and hated your rival for never letting you have Eevee from the start!
The way your Pokemon got XP was mainly through catching which was a different approach it makes sense, as this game was focused more on bringing the "Pokemon Go" hype into an actual console game - hence why the name "Let's Go".
It's a nice entry game into the Pokemon franchise, as it starts with primarily just the base of Kanto, limiting the number of Pokemon for beginners and also giving useful tutorials especially before being able to enter a gym, to make sure the player is decently prepared. For veterans this might seem silly, but a lot of players who only had played the mobile game prior would need a little helping hand to really get into the games.
Walking with your Pokemon was super enjoyable, as they actually had some decent scaling compared to their actual size (mostly), even though some disturbing things got revealed, such as Venusaur running like a frog.
Either way, I think this is a great game for newcommers to the franchise which every Pokemon fan should be able to appreciate.