Great title that doesn't quite match up to the original. First major issue is that getting the true ending is borderline impossible without a guide. Second issue is that characters feel more one note and anime-tropey compared to the first game, even if they're still likable. Third issue is that the added content doesn't change depending on ending like the first game, just assuming you got the true ending.
Gameplay wise, however, the game is great. It's basically the same as 1 but with more moves, demons and characters to mess around with, making team building super fun. The story, while not matching up to the original game, is a unique premise detailing a more capitalism vs communism narrative instead of the usual SMT God v Lucifer one, and explores the concept well.
Overall, while not as good as the original, it's still a great sequel you should check out

The best Pokémon game. Hands down.
The story isn't the reason you play a Pokémon game, but it's nice to have. N is the best Pokémon rival and watching his story is genuinely great. The gameplay is fun and a decent challenge, even if the main map is rather linear with some really cool areas such as Relic Castle. The new Pokémon are mostly great even if the starters are admittedly lacklustre. The postgame content is great, with an entire half of the map to explore with some old Pokémon returning. The soundtrack is easily one of the best I've heard in a game, using the DS hardware to it's fullest potential. A great game I wholeheartedly recommend