The King said:
it is not the d20 system per se which is complicated, it is rather the constant need to calculate and recalculate the bonus and malus each time for the attacker as well as for the defender. This spoils all the fun.
I don't think I follow you here, either. The character is either making a standard attack or a Finesse attack, and those modifiers are clearly marked on the players' character sheet.
d20 + STR + BAB
d20 + DEX + BAB
What's hard about that? Players will know these by heart.
For stat blocks for NPCs and creatures, the total is already made for you.
GMs should always have these pre-calculated in a stat block.
So...I don't follow you.