Sorry to hear that you can't play it yet Kikae. It'll be worth the wait though.
I picked up my pre-order yesterday. It was one of my most anticipated games of the year and I'm happy to say that it hasn't dissapointed so far.
It is very different to previous Metroid games as it's much faster and combat orientated, but I think it still keeps the Metroid flavour. I'd give it a rating of 'freaking awesome'.