I've never had any of those problems with the full access stuff. I'm thinking it's because the main page is a static page that needs to be updated manually.. and when things are updated manually, people make mistakes.. it's that simple.
I have to admit there were some very old lessons on the site (remember, there are thousands of lessons) that were missing the sound files or a link to an "external" site no longer existed that I found about a month ago. There was only a few of them but as soon as I reported it, within a few hours I had a response from a moderator/admin with an immediate solution, mostly in the form of a "new" lesson that was better, more descriptive and had "video" as well... So all-in-all my experience has been better than any other website I have ever paid for subscription to. If I had to rate it on the spot right now I'd probably give it a 9 out of 10. It's not perfect 10 out of 10 but it's close enough for me.