Small.
It's great as a tool to teach people how to review, but the choice of font and colour made it hard to read. The screenshots of the newgrounds website were also incredibly small and difficult to read, and personnaly i don't see the point in timing how fast you reach the submit button. I like to read over my reviews before I submit them anyway.
This flash as great potential, but make it a bit longer and more detailed, and also avoid using screenshots that big that are scaled down.