I'd suggest that you enable sorting options for reviews that show the lowest ratings. As detailed in XKCD comic #937 it's hugely important that you can see the low rated reviews and assess people's problems and issues. Especially in a market that is so inclined to wear rose tinted glasses of greater nostalgia +1.

Just an idea.

1) Sort by highest rating.
2) Start from the bottom of the page.

Done

I assume they mean sort reviews by lowest rating, not games.

Which isn't really super relevant as GOG does not sort games by highest rating either. It's sorted by amount of people who found the review helpful, which is a reasonably good way of avoiding the situation in the comic the original poster cites.

Is it at all possible to sort reviews by anything other than "most helpful"? I would personally like to sort by date.

Just add a simple filter!
I usually check the worst reviews first too, but putting them at the top doesn't make sense.

That would indeed be useful because in some games the reviews would critiziise thibgs that are fixed in later versions.