For the Theorycrafter:
Rogue AP = (Strength -10) + (Agility x 2) + (Charlevel x 2) -20
1 Agility ~ 0,125 % Critchance for Level 20, -> 8 Agility ~ 1% Critchance
1 Hitrating ~ 0,54% Hitchance for Level 20
1 Critrating ~ 0,31% Critchance for Level 20
1 Agility ~ 0,103 % Critchance for Level 24...