Okay, this thread could use some real discussion and it is an upcoming game (that on top of everything I might expect to be popular among many people here).
So...
What I've heard from reviewers/demos/etc... is that the game has truly excellent controls/gameplay in general, mix of 2D and 3D and using motion controls. I can't speak for it firsthand, but you routinely see things like "they might already say the Wii controls are all right but Metroid: Other M makes all those other games look clunky"
There's a lot of Internet debate or whatever about they story and other aspects of the game, I've read a little and even read/seen parodies. And actually, seeing that preview, which I hadn't seen before, I guess I really had not realized how much Samus has been sexed up or whatever you would call it. Again, though, I know very little about the game. These two things are probably the average starting point of such a discussion about the game though - gameplay and controls or so on or you know, whatever else you want to observe.