So, in preparing for a one-shot campaign, I realized something - a Zombie Hill Giant, despite being 12th level and dealing more damage than a critical hit with a shotgun, has a +3 to hit. The concern for me is thus; should monsters be using Strength for attack Rolls or Dexterity?
Strength seems silly as the basis for attacks rolls for most characters, but then again, I don't plan on giving the option to characters, at least not without maybe a feat.
In the case of Dexterity, though, you're not dealing with fine control over attacks, you're dealing with wide, sweeping blows, so this seems like a bad basis for monster attack rolls. Most of all, though, is the fact that since most monsters have rather low Dex due to their size, things like the aforementioned Hill Giant Zombie come out with ludicrously inaccurate attacks.
Next basis: since they're not going to use Str for Parry attempts, most monsters are shorthanded by the reliance on Dex while they have huge Str scores.
So, house rule: at least for monsters, the higher of Dex or Str is applied to attack rolls, not just Str.