It wasn't mercy to europeans, I just wasn't very impressed with the game. It's a Metroid Prime franchise game first, and a wii game only a distant second. The controls aren't bad, except for their overuse of the wii's very flaky in-out motion sensitivity. It's just that it sticks to the franchise which was designed in expectation of horrific gamepad aiming, so that greater accuracy in combat just isn't all that relevant. The parts where accuracy does matter - shooting panels on the roller coaster and whatnot - all end up feeling very tacked on.

Adding in genuine locational damage and speeding up the beams so they didn't move like a 6 year olds softball pitch could've helped tons.

I'm dissappointed, really. MP1 was a classic because they looked at the Metroid formula and rethought it to fit the environment. The changeover to the wii just doesn't get the full treatment - they stuck to the formula, added a few things in , but just didn't rethink any previous decisions.