Talking about hard, last weekend I tried to beat Metroid Prime (1) again... In both tries I couldn't kill the boss.
I must have lost my touch. Also, the way to it is very annoying, with all the Metroid who keep respawning...
I also started in MP2, it's good so far. A bit different than MP1, but I guess that's good. It's not too hard yet, I just got my bombs back from that worm.