This is the only time I will ever address the second-most popular dead horse to flog in gaming: Ascending vs. Descending Armor Class. It must be summer, because that topic has come around again.
It is my heartfelt belief that one person- and one person only- need concern themselves with armor class – the referee. Every player knows after their first five minutes of gaming that rolling high is a good thing, and that the higher they roll, the better chance they have of ultimately making the monster fall down dead. The referee will tell them if they rolled high enough on a case-by-case basis.
The referee should use whatever method works for them, whether it be Ascending, Descending, Letters, Astrological Symbols, kanji, ex-girlfriends’ phone numbers, etc. as long as they can give the result of an attack immediately after the die is rolled. No method is intrinsically superior to another so long as this sole stipulation is adhered to.
To quote Mr. Dave Arneson: "Don't ask me what you need to hit. Just roll the die and I will let you know!"