Just to throw out another idea, what if there was a standard form for Showcase feedback (and perhaps a “Feedback” button next to the “Reply” button)?
Something like:
[b]Standard Showcase Feedback[/b]
I played your game on <insert system here>.
[b]Bugs to report[/b]
<insert details>
[b]Suggested improvements[/b]
<insert details>
[b]Other comments[/b]
<insert details>
Would that make it easier to provide feedback without feeling obliged to lie through your teeth and say how much you enjoyed the game?
Simon