There was quite some debate about this before the law came into place and I’ve honestly no idea if a firm conclusion was ever reached.
Since our reviews are tied to our usernames, which themselves are considered personal data, one could argue that the reviews constitute personal data too. Whether or not this would hold any legal weight I’ve no idea, but I too am very interested to hear a legal perspective on this one.
Plenty of discussions can be found on the internet. A popular opinion is that unless your forum post (or in our case, a beer rating) contained PID (for example if you wrote your name and location in each rating) it would not count as personal data. But it seems that it is just that - an opinion.
EDIT: Just to add. Many big companies (Facebook, Twitter, Google etc.) have enabled the option to download literally all your data. I don’t know if they are simply safeguarding themselves, or if this is because of their interpretation of the law is such that anything you write is your own personal data so they feel they have to provide this option?