The FAQ addresses some of these points. If you keep your username sufficiently unique and secret then no-one can edit your list. I wanted a really low barrier to entry for trying out the site i.e. no email addresses or login via a social media service.

The service shows you albums from the last 5 years but that could also include re-releases (which might explain the Slayer weirdness).

Thanks for trying it out and the compliments.

It's certainly worth a try, but don't you think finding an unguessable username is more of an entry barrier than the usual username/password combo?

You are right, it links to what looks like 2009 re-releases for those 3 albums, but it still doesn't have their 2009 actual release...

That's ok, keep up the good work, will be even better when you integrate last.fm!

An image upload site I know of used the same approach to 'login' and I quite liked it - I suppose the ideal configuration would be to give the user a choice. I had to nail down on feature creep at some point or I was never going to ship anything.

I'll look into the missing album though, edge cases like that are handy to know about for data quality.