That's also true BUT (there's always a "but", isn't there?

):
- The tag cloud isn't intended to replace the search function so if I'm able to find what I need with the tag cloud (and a few mouse clicks), I'm happy. If I can't, I can use the search function (or vice-versa).
- Tags on threads can be edited. I don't know what the rules are governing tag editing are but at the very least I know tags can be added. So a thread with inadequate tags could possibly have better tags added to it.
- As people actually start tagging and get their brains wrapped around the concept of the tag cloud, tag quality should improve unless people intentionally want to screw it up.
The tag cloud is a new concept for just about everyone here (you and I included) and once people adjust to it they will either use it (and hopefully contribute to it) or they will ignore it and look for ways to hide it.
I do think it would be a great idea to allow those not interested in the tag cloud to be able to hide it (as well as the tagging function) to help preserve the integrity of it, meaning only those interested in it could use and contribute to it.
Peace...