"Please review my stuff without playing it. If I didn't write it well enough to get you excited to play, I've failed, and you should say so".
Obviously, this trickles down a bit from yesterday's post. I believe the Evil Hat Man to be right; I think there's a lot to be said for a game that gets you excited to play in its reading. This can be through the author's own enthusiasm for the game, through an excellent presentation of rules (you can be excited that you get it), or through great and/or suitable accompanying art.
But mostly I find that if an author can't convey a sense of interest in excitement in their own RPG product, they're going to have a much harder time selling me on it. It's a problem I think a lot of late D&D 3.5 splatbooks suffered from, actually.