Yet, despite all of that, I tend to get bored playing. I don't really know why -- it's likely just a personal gameplay preference. I find the game to be pretty easy, which several other reviewers have also said. Some of the questing is necessary, and can get tedious -- you'll bounce between areas and the game forces you to talk to many/most of the townsfolk in the heavily populated game world. If you're a completist, and want to ensure your characters are buffed, the game will have you backtrack to old parts of the game a lot -- you'll learn a new exploration skill (e.g. how to jump higher, how to pound yourself a tiny mini-Mario, etc.) and then have to go back through everything you've already explored to hit the places you can now get to but couldn't before. Some players will love that aspect -- but as an obsessive-compulsive game completist, I find it to be a chore.
If you're new to this series, it's a very creative but ultimately pretty standard turn-based RPG with timing based attacks. You'll wander the game world, encounter monsters which then enters into turn-based mode. You can then execute different types of attacks which typically require some kind of timing-based action to maximize damage. Enemies strike similarly, and you have to learn their patterns and how to avoid taking damage by jumping/hammering/moving at the right time. In JRPG style most of your stats move up automatically, but there is some minor customization along the way. There's a also a lot of options for gear and buffs to make the gameplay more varied.
Overall, the game is extremely well done, but for me it can get a little tedious.