Registration process? I seem to have missed that part. I signed up and gave details but that took very little time at all.
1. Was the time it took to go through the process worthwhile?
Yes, although I don't recall it taking very long (registered a week or so ago)
2. Did you cheat?

Cheat how? I don;t remember there being a test (did I miss something?)
3. Did you learn anything?
That's the whole point of joining :-)
I am a member of the UK HomeBrewForum as well, but it never hurts to have more information available.
4. What impression did it leave you about the site culture?
I don't recall registering leaving me with any real impression of site culture. That said, I have read a fair few posts and it seems like a good, supportive and informative site. Nice :-)
5. Should we change anything?
Nothing I have yet spotted...