delericho
Legend
First, YES, as THACO was written, it WAS superior for the style of play I enjoy. In life, people don't advance at the same rate, and those who train in certain areas are better than in other areas. 2e simplified the THACO equations so fighters advanced in their bonus to hit at a 1/1 level ratio. Rogues at a 1/2 ratio. Priests at a 2/3 ratio, and Mages at a 1/3 ratio.
I never had a problem with subtraction, which is all THACO really devolved to (and it really is kind of sad how many new comers think subtraction is really hard...they should try calculus sometime, or business stats and trigonometry which are things I used to do on a daily basis before retirement!).
It's not that subtraction is hard, but for almost everyone it is harder than addition, and certainly takes longer on average. Ascending ACs and attack bonuses (as used in 3e but also in some of the retroclones) are generally better than THAC0. (Though your point about having different rates of advancement for different classes is still true.)
That said, there is a "roll 20" variant where you roll the d20, add attack bonus, and add the AC to aim for a target of 20 for a hit (and where a lower AC is, therefore, better). This is quicker still than the "d20 + bonus vs AC" model, but only if ACs don't drop below 0 and only if the player involved knows the AC of the target. If either of those isn't true, the benefit of the system is lost.