Pros:
Emulated the "feel" of 2D Metroid in 3D. Fast Samus who could really jump around and such was back. As such, you really felt a thrill navigating the world with abilities that were diminished or outright absent from the Prime games.
Game was just sexy as hell. One of the Wii's top graphical efforts

Cons:
-Basically a retread of Metroid Fusion, wandering a giant space-station that simulates environments of one of the worlds from a previous game. Even had some of the same bosses as Fusion (Nightmare, though admittedly Nightmare was one of the best bosses of that game).
-Poorly executed plot. I could see what they were going for, i really could, but they just needed a really competent writer on board to bring that vision to life.
-No pickups. A minor, niggling point, but it really changes gameplay for the worse i feel.

I didn't find the whole "Obey orders, ignore suit powers" thing to be too egregious, just because its no more contrived than the beginning of Metroid Prime where Samus just happens to get hit by an explosion just right to de-power her but not kill her, or even worse in Metroid Prime 2 when the Ing had Samus completely in their power and decided to let her return to the Light World alive after stripping her of her powers.

i havent played, but i am curious to see what the results are

the game is good , not as good as the other metroids, but don't hate on it it cause it's different ,the game is alright and fun to play so hm

Metroid: Other M is a good game, but it is not a good Metroid game.

-The story had plot holes all over the place, and it destroyed the characterization of Samus that we have had for decades.
-Exploration was minimal.
-No health or ammo drops from enemies really changes how the game is played.
-Samus is too acrobatic. In the 2D games, dodging was based on well timed and well planned jumps. You couldn't just flip all over the place. Samus has always been a bit of a tank. Not so in this game. This becomes a serious issue in hard mode, since you basically spend most of the game dodging something.
-The parts where you are frozen in place and need to look at something are annoying. This is a minor problem since there are so few of them. However, there was one that had me stuck for at least 5 minutes.
-Why can't you move when using missiles? In all other games it is easy to swap from your beam to missiles and back. This game makes it a huge ordeal to fire missiles.

That's what I can remember off the top of my head. It has been awhile since I played it.

There's no "all of the above" option. Pity that.