As others have no doubt long since covered, this isn't the best introduction to the Discworld - but at the same time, I think it's solid, and does some things well.

The book is reliant on satirising a type of fantasy novel which has become less popular in the decades since. Without that context and indeed even understanding it but looking back all these years later, I think it's solidly "OK", with a few germs of ideas that will become something stronger later but not itself really hitting the heights.