The first few minutes of Ori are just incredible. You get one of the most emotional cutscens in all of gaming history, told in a way that reminds me of the Disney classics, both in the sweetness, music, and in the wonderful aesthetic of the game, which resembles fairy tales. This fairytale-like atmosphere never leaves the experience, thanks also to the occasional narration of the event from an outside perspective. The events told are very simple (suited for fairytales indeed), but never stop being engaging, even if for large parts of the game they feel absent.

The best part of Ori for me though is the animations and movements of the protagonist. Going around the map is simply a pleasure, and it gets even better whenever you get a new upgrade based on your movement (dashes, higher jumps, bouncing on enemies...). On the other hand though i didn't like the "action" part of this metroidvania; while the exploration of the map and the whole movement system is a joy to the eyes (and to the gamepad), the shooting mechanics are just boring, and slow down the rhythm of the game, expecially on higher difficulties, where enemies can be very spongy. This isn't helped by the fact that leveling up can feel like an ordeal (mostly in the middle part of the game), and leveling up also means reducing the time to kill enemies and the fluidity of the gameplay. This was really nagging the experience during the first half, but it got better towards the end.
The exploration is really rewarding, but i didn't find as many secrets as i had hoped (even comparing to other metroidvanias). Somehow I think that the game would have been better as an "open platform" and not as a more classic metroidvania (so less shooting and more moving).

My opinions on Ori changed a lot while playing it, but i never thought it was a bad or mediocre game. In the end I think that the strongest parts of the game get dragged down a bit by some more annoying elements. This could have been a real masterpiece, but eventually it's "just" a really good game.