I just beat Metroid: Zero Mission. It didnt suck me in like the first three Metroids but it wasnt bad. The difficulty was all over the place. Some of the boss battles were easy, some were hard... it seemed like they compensated for the higher difficulty with putting save points damn near everywhere and you restore your health and ammo completely at every save point. It took away any incentive to learn enemy movements and attack patterns and there was no real reason to use missiles since your main beam was so over powered. At the end, many of the enemies could be killed in one hit. Nintendo is usually really good at leveraging the difficulty in games but this one just felt all over the place. I wasnt trying very hard and Im not the best at video games and I was able to beat it.