Okay, so as someone who isn't too skilled in the game but has a fair amount of experience (Read: Has all bronze, over half silver and a few gold badges as well as having completed HMP 2 times), I find the jump in difficulty from HMP to UV to be a bit too steep.
Now I'm not saying anything about the increase of enemies (Former sergeants for me are a universal problem with their FRIGGING Hitscan shotguns and knockback. Seriously, if you're against a wall and there are 2 sergeants next to each other, unless you have a shotgun yourself you'll simply be juggled to death of you'll get lucky). In fact, the extra experience does help. My biggest problem is how stronger enemies appear earlier. Seriously, Hell Knights on level 3?!? Unless you're going for a shotgun build, they will ruin your day as they take far too many hits to kill at that part of the game while dishing out too much damage to endure.
Now before you say "Why don't you use shotguns then?", I want my first UV win to be on AoMr, so I have no access to shotguns. Even worse: Pain Elementals on level 4-5 and Hell Barons on level 5-6. What's next, Mancubi on level 11 and Arch-viles on level 13? Until you get a master trait (I generally go for Bullet Dance. Yeah, it's my favorite), you'll be forced to ru-oh wait, I also am used to going for YAAM's, so I don't run. Something in me just forces myself to not run until everything is dead, unless there's a time limit like AoRA or I can't kill off everything like AoD.
I know this sounds like me whining and, well, it kinda is, but I just find the difficulty spike to be a bit too steep.
If anyone has any advice on how to survive UV on AoMr, then please.