My biggest problem was that I didn't have an internet connection so a buddy downloaded the game for me, so I had absolutely no clue what was in waiting for me. Oddly enough I kept falling back to ADOM tactics, things running in diagonals to help dodge shots and never stand directly in front of a door you are opening, and they seems like they work
The change to the arena was both welcomed and annoying, cacodemon spawned next to me on stage 3 but I got it with my combat shotgun (thank you shottyman), the blue armor and the rocket launcher at the end are definitly worth the extra trouble.
The BFG in the city of skulls didn't burn that much ammo, 2 shots while the walls were still up and swaped to my advanced double shotgun (BTW shottyman still kicks ass) to clean up, got 2 fully loaded BFGs, 80 power cells, some shotgun shells and lvl 7 (tough as nails).
Is the Unholy Cathedral even possable for anything but a strict melee character? I almost killed by just the lost souls nevermind the AoD.
I only swaped to the advanced plasma rifle on lvl 19 because carring all that 10mm to keep feeding my extended chaingun was getting to be a pain and I ran short on shotgun shells.
I know I got very lucky with the Mortuary, it looks like it could get ugly very quick but the rewards are some of the nicest in the game.
Found a nuke on 23 but a baron destroyed it before I got it.
It might just be me but I like the pain elementals and the arch-viles, fighting them adds a major exp gain for a shotgun player but I need more practice to scum them (btw no decriptions or pictures?).