I saved up my allowance for AHQ when I was a child and I never regretted the purchase (I purchased WHQ years later as well.)! The Skaven have long since been abandoned, the doors have all broken, and the tiles were destroyed in a flood... but that doesn't stop me from loving it.
I agree the model selection was terrible and a little too on the nose with GW policy of encouraging you to buy more, but since I already owned HQ i used all those monsters (and my growing collection of fantasy minis) and the Skaven were just a bonus. The tiles and heroes/henchmen were just more tools for the dungeon crawling toolbox. GW latter rectified this lackluster model selection with WHQ, but this was another clever "buy more" trap, because they only gave you the models needed for 1 out of 10 battle levels...
I think the artwork is classic, even if the box cover does look like a rejected version of the HQ art. The interior art (many of which by Gary Chalk I might add) really paints a bleak and brutal picture, and that is just what this game is! Every victory in combat is a hard won fight, in this game where all that separates you from a monster (statistically) is a couple of fate points and a magic item if you are lucky. Hell there is a whole section in the rules about how to run away from combats and leave the dungeon to return when you've healed up (quests are broken into many expeditions, if you press your luck and take fewer expeditions you get better fate point rewards).
http://boardgamegeek.com/thread/171457/it-could-have-been-a-contenderThis review sums up most of my thoughts nicely. The game suffers from door tactics slowdown even more so than HQ but that is solved with some house rules for pushing combats away from doors (making an already difficult game harder).
I have always wanted to go back and play classic HQ quests with the AHQ rules, though I see every quest containing a Bloodthirster(gargoyle) as a frantic flight to the staircase!
Thantos: be aware there is one piece of errata in the white dwarf magazine, Orcs have 7 toughness instead of 8 (they already have 4 wounds which is as many as some starting heroes!!)