i can see whhy people dont like idraw, which i why i say that i like it because it works best for me. right-click serves as an eyedropper (which is nice) and you can define all hotkeys (like many other programs but still nice)
the main selling point on idraw im is the selection tools, which are not as powerful as photoshop (no AA ability) but feel much better when i am using them. I really only use 4 tools: the rectangle to draw, the pen to sketch, and the magic wand + rectangular marquis to change selections. A program which doesnt make these really fluid just doesnt go with how i work. GraphicsGale loses out imo because its selection tools (no shift/alt functions) and the fact that it cannot animate a sheet. i hate using separate images per frame, and Idraw's custom animation preview for me is the best (especially if you have the later version that can save animation schemes)
Promotion i think is probably the most well-rounded program ive seen, it has many more things than Idraw, i just dont use it because its not as comfortable to me and i havent taken the time to explore it.
MS paint has nothing. you need to select the eyedropper or go down and click on the palette every time you change your active or passive color. you cant do anything while selections are drawn, and you cant make complex selections. you cant save with a unique palette unless the file was opened with one already existing, and even this one you cannot alter except along the standard (often useless) schemes that it offers