I seemed to have stepped on a few toes with my opinion about Hunters. While the game isnt the worst game ever, or quite possibly the worst metroid, I maintain that its share of flaws broke my interest.
1) The controls were pretty rough... simply, it needed an analog stick, and badly. They had several different control schemes, but there wasn't really one that allowed for both good movement and good aim. I typically chose the former. Sometimes I would switch controls mid-game if I picked up a sniper, but the "aim-centric" controls also made the hand holding the DS get really tired.
2) The DS just wasn't powerful enough. You might have been able to get by with the "sandy" graphics on a TV screen, but the rough graphics did not manifest themselves well on the little screens of the DS.
3) The combat system suffered terribly from the controls. You always felt like you were getting torched either because you couldn't aim well, or you couldn't easily jump/strafe simultaneously.
4) The level design, while reasonable, wasn't up to snuff with the other prime games. I realize that's a high bar, but there it is. In the end, they ended up reusing too many ideas/assets in the later levels of the game from the beginning and things got boring quickly.
5) The enemy design was decent and the other hunters were pretty cool, but the boss design was atrocious. If I remember correctly, there were only two real boss designs, excluding the final boss. I think they mixed it up by giving them more health/faster attack patterns/vulnerability only to specific weapons/etc. DUM. I might have been able to forgive most of these sins, but the controls were what really killed it for me.
Popular or not, most first party IP launch titles do pretty well, and many of the flaws are forgiven because there is simply nothing else to compare them to.
It is probably an unfair assessment of the situation to call the game a "misrable failure" and I am not above rescinding my "insult".