Pokemon Scarlet is, in my book, a return to Pokemon greatness!! The nonlinear approach is especially outstanding and inspired (you can beat the gyms/enemyteams/titans in any order you want, literally), meaning the game has a lot more of a choose-your-own-adventure feel than any other Pokemon before.
In addition, the difficulty curve FINALLY feels challenging for the first time since Generation 5, which is huge! (GameFreak seemed to have a LOT of trouble balancing the difficulty for the new, Exp Share on era, making every game from X/Y feel unusually like a cakewalk at all times).
Many other little touches make this entry one for the books: Pokemon running next to you and fighting/exploring all on their own, a legendary that's with you since the start of the game (!!) so you feel more attached to it, making Pokemon eggs anywhere you go, and the most addictively gorgeous Pokedex ever!
I've been a lifelong Pokemon fan, since the Red/Blue era. I really adored the first 5 generations (up through Black/White), and then started feeling like it was taking a turn for the worse. The games were still enjoyable in various aspects, but I felt like something was missing. With this entry, I feel like GameFreak has finally blazed a fresh, new trail, and I'm very impressed.
Highly recommended!!