Where can I find mature user-created campaigns for Battle for Wesnoth? [closed]

I can download user-created campaigns from the extension-server, but the quality is varying. I'd like to find a list of campaigns that are complete, mostly free of errors and playable.

I don't want to download a campaign, play through 3 scenarios and then have to see, that the campaign is incomplete (no other scenarios, but the storyline hasn't ended yet), or some bug make it impossible to progress further.

I suggest you look at some of the Imperial Era Campaigns which are of good quality.

There's also the dedicated forums for user-created campaigns on the Wesnoth forums on which you can have direct opinion form the players and updates on new and upcoming content for customized campaigns and scenarios. :)