Team Ninja is infinitely better and from the looks of it, understands the essence of the series a lot more.
I don't understand why you're saying this. What was so un-metroidlike about Primes 1 and 2? 3 was a little... meh, but overall the series did a good job of transposing the metroid formula into a 3d environment. Please don't tell me you're one of those people that STILL aren't over the fact that its in first person.
It's too early to say whether Team Ninja "gets" anything, and the pseudo-2d gameplay doesn't mean jack if you can actually pile-drive enemies into submission as the trailer suggests.