I'm posting this thread before I forget the idea, so I intend to come back to it at some point and devote myself more fully (possibly).
I've linked new members to the "Socionics Tests" thread (where there a list of numerous tests) a few times bow, but I felt dissatisfaction when one such member took a test that I believe was far from satisfactory (my personal opinion of course). If ratings and commentary could be provided, this would be good, and perhaps the tests could be ordered accordingly. (The Sociotype test at the top, if I recall, is actually a good one, or is likely to be a good one, if I do not know of it, so if new members simply did that test, that would be an improvement).
I think a reasonable criticism is that showing a preference this way might end up with unnatural bias...that's not for me to have to consider anyway!
In any case, just rating them may be of some wider use, and of course will allow you to collect many test results together. (I suggest you don't rate tests that you had a significant role in putting together however ).
Either: give each test a score, or rank them in approximate order of preference. Perhaps if you are unable to finish a test because of your displeasure towards the test, you could put this at the bottom, or maybe you'll think it better to simply not rate it.
Useful commentary might include approximately how long it took you to take the test (vaguely), and how difficult you considered it to be.