larchy, the ranking system works perfectly for me! Very nice that abandoned maps are now hidden from the official list.
Also, to make sure you don't have enough time to breathe, I think we should try and come up with a better way to update and maintain those "official map threads".
First, I think you should be sent to the most recent post rather than the first page of the thread. That would solve a lot of the initial confusion.
Then (and this is of no priority for now, just an idea), I think that the map-thread should re-start with every new release. For example a beta2 map should start with a changelog about what is new, then the feedback posts about the changes. Beta3, the same... For the final release, you should just use the comments (in fact, direct comments should be disabled for beta maps, I don't know if they are right now).
Now I have no idea of how to implement this elegantly, but I generally liked the system of the old-old Snarkpit, where you could have "thread chapters" for each release (sadly usability of that feature was not-so great and few people used it). The main flaw of that system was that people didn't recognize what chapter was the latest and just posted randomly. This could easily be solved by locking outdated ones (just keeping them as an archive).
I think that the map forum is still one of the most important features of this site, and would deserve some extra thought.