@Yokel
The more I look at it, the more I believe HD-Torrents should be raised to a level 6 tracker. I'd put it on par, if not marginally better than AwesomeHD, and one level above HDAccess, as HDA is just too easy to get in. I'm not a member of HD-Spain, SceneHD or ToTheGlory so unfortunately I can't comment on these.

Besides HDBits and TTG, its got the largest userbase and most active torrent numbers. Although maintaining ratio is easy, I wouldn't deem this a bad thing its just there are a lot of leechers for all of its content. Obtaining an invite is quite difficult, as they are a rare commodity due to the fact they can only be bought for 1000 bonus points (which take forever to accrue as you're given 0.008 per torrent and 0.002 per GB per hour). Their internal releases are fantastic, such as KRaLiMaRKo and HiDT, plus they end up getting releases from most other trackers anyway at decent pre-times.

My only real gripe is that they should set a more stringent standard for uploads by promoting the use of media info. This is one thing AHD do better, and it allows for greater control of releases and ensuring the lower quality ones don't slip through the cracks. Otherwise, it is a bit too easy to rank up but that's quite a non-issue.