I've tried AoMr on HNTR plenty of times and in a lot of ways it feels harder than AoMr on HMP. The thing that hurts the most is the lack of experience. in that scenario, I am maybe level 6 by the time I get to level 15, and so the bruise brothers are a tad difficult to take on. I've also never managed to defeat the arena on HNTR AoMr, simply because all you have is a pistol with level 2 SoG and maybe a couple med packs. Not sure how you're meant to handle all the demons and like, what, six cacodemons with just a pistol. At least on AoSh I've got a combat shotgun, but in that case it's dead easy. I'm assuming it's (meaning AoMr arena on HNTR) just massively difficult to do, but I also imagine if you can pull it off you'll be set for the rest of the game, especially if you're also able to take out the arena master. But I don't see that happening. HMP? Sure, but not HNTR.