Which ones did you like?
At the risk of adding spoilers: The Queen Metroid and Phantoon were my favorites. I believe there was at least one more that I liked, but I don't remember. I found the Ridley fight to be uninteresting. After so many excellent battles with him in the Prime trilogy, there wasn't much they could do to top them.
That construction/heavy machine equipment battle was the worst one. Ridiculous battle. Big machine like a freakin loader dombined with a bulldozer, but it moved like lightning and could turn on a dime. Fucking obnoxious battle sequence.
But the Metroid fanboy in me was just giddy as hell when the Queen and Phantoon entered the fray. I only wish the rest of the damn game lived up to the joy of those two battles.