Can't say I agree with the review (that scene where the character sacrifices themselves was awesome!) but also the traitor subplot is supposed to be figured out, not resolved. The traitor is logically deducible, and is more fun that way too.
But besides the story which I agree was poorly handled I thought the gameplay was pretty awesome, certainly faster paced and more engaging than Prime, but also still resolutely retro. If a sequel was announced tomorrow I'd get excited (and considering it's metroid a sequel probably will get announced tomorrow).