Spatula said:Natural 1's and 20's have no special significance on skill checks (only on hit rolls and saving throws).
You are right, it was one of the first house rules we did and I often forget we never have played D&D RAW due to the number of inconsistencies. Makes no sense that a 1st Level Wizard with a Two Handed Sword with a -4 to hit can hit a creature with an AC of 40 on a 20 but can't make a DC 40 skill check with a +10 on a 20. Likewise a +30 to hit can miss an AC of 10 on a 1, but a +30 to a skill check means you don't have to roll for anything under DC 31...