Torm said:
You had me sincerely worried with this, until the bottom of your post!
That always make me snicker. Lots of people claim to hate the old 2nd edition thac0/AC thing, but, really, other than the AC capping at -10, it's.. Pretty much the same mechanic as in 3rd edition. Lesse. Assuming you use the STR modifier of 3rd edition, for simplicity's sake.
A fighter level 1, with 14 strenght and a "normal weapon" attacking a monster with an AC improved by 10 would need to roll an 18 in both systems to hit.
same fighter, at level 10, (with same strenght and weapon, for simplicity's sake, but changing them would change nothing) would need an 8.
It's the same thing at every level. All the time. Sure, some classes have a modified BAB from their Thac0 in 2nd edition, but that's more of a balancing thing, I imagine. The actual mechanic is the exact same. So technically, I guess we all borrowed the Thac0/AC mechanic, and just removed the -10 cap.