Dos and Don'ts of C3G Design for Fans and Allies

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I'm just reflecting a bit and think this would be a good idea for a thread for new designers out in the public. Basically anyone with wisdom to share is welcome to reply here on what does and doesn't make a good design. Maybe everything could be condensed into a quick guide for the welcome page.

These first few are mostly just a few things I picked up along the way from various Heroes and members that will help anyone new to the designing for the game.