FWIW I strongly disliked The Beginner's Guide—I wasn't a huge fan of the Stanley Parable either, but The Beginner's Guide was significantly less enjoyable even so. I know the game gets a lot of positive reviews, but if you're on the fence already, I'd strongly caution you against blindly trusting the reviews.

There's definitely an element of personal taste, though—I tend to really dislike media that I find overly philosophizing (i.e. when I feel like the authors' arguments are too confident, or otherwise discourage the audience from thinking themselves about the arguments or conclusions). That is to say, I might be precisely the wrong target audience for this sort of game :-P