Not specific to GW2, simply do not half-ass a system in. If it has to be in, make it right and push the launch date. If it does not need to be in launch, then hold off and patch it in later with sufficient testing. I would suggest a public test server. Its amazing what good things can come of those. I will agree with posts above regarding many lottery/random items, especially for cosmetic gear. While I reserve some epic rare drops should be just that (epic and rare), I think most things in the game should be a true reward and an achievable goal. When I can buy 1000 boxes and not get a neat holiday/event skin, and the next guy gets it on the first try that is a broken system.