Ok, I'll start by sayng that I have not seen a fraction of the amount of movies the rest of you seem to have, nor have I seen any of the "classic great moviies" but I feel like the 4 lead characters in Set It Off did nothing short of accurately, and believeably portray every ounce of emotion their characters were dragged through, and to me, that's what good/great acting is: not just being accepted as the person that does "this" and is "that", but manages to do so in a natural way you'd see a real person be, act, and feel when experiencing the things they do. When I believe how you feel, rather than simply accept that that's what you're character's supposed to be feeling, is what real acting is to me, and I felt like everything they did in that film was anything less than great.