It has a "point buy" system where you can add and subtract points, so only the total is really useful. Different classes also have different minimum stats - so

It has a "point buy" system where you can add and subtract points, so only the total is really useful. Different classes also have different minimum stats - so the calculation is actually rolling 4d6, excluding the lowest, and then rounding up to the minimum if necessary. This means multi-class characters (who might have minimum of 13 in two stats instead of the usual 9), or odd classes such as Paladin who have a minimum 17 charisma end up with much higher average totals than other classes. It's an entirely broken system, designed for pen and paper D&D where you roll your stats and then choose your class based on what you get, adjusted for video game players who prefer to choose their class first.