Starting a stickied topic about the GameTalk issue of the week...
mod edit: just changed the icon for the thread :)
OK, in this case, I get to add one MORE important thing:
Edit your damn rules. Read them, re-read them, re-re-read them, give them to somebody else who's facile with the language to read them, put them to the side, read them again, &c.
It really, really matters and bad editing and proofreading can ruin the experience of an otherwise potentially excellent rule system.
hmmmmmm... I can only guess which rules you've been reading lately! :D
+1 to Cyrano's comment. Poorly written rules can almost kill one's desire to play a game. I would also recommend "include multiple examples of play" in your rules.
For computer games, I would say game devs MUST include some kind of quick mission builder. Although tutorial missions and scenario development tools are great, I still get lots of mileage from games that include this quick missions.
+1 Yes, I do find 'examples of play' to be extremely helpful.