HDCorea always related. Many users lost their accounts due to the frequent
IP changes of this
tracker.
And many others..
-
Trackers who allow compressed rar's torrents.
-
Trackers where you have to upload/download a certain amount of
gb's per month, otherwise you'll loose your account.
-
Trackers who don't have a proper bonus system, neither freelech torrents.
-
Trackers without Re-
seed options(some admins of these says the uploader doesn't have the responsability to
seed it again after 5 snatches).
-
Trackers with a terrible logo, layout or design.
-
Trackers who advertise themselves(spam) on other
trackers.
-
Trackers where you have to create an account to download torrents, but they're always open(some say it's for security, but that's questionable).
-
Trackers without an
IRC.
-
Trackers who ban another countries.
And much more, these was just some topics i could type in my experience as a home user.
TL;DR there aren't just one.