It's been a while since a single VN burned me out completely, but Silverio Trinity managed it. That VN had many of the best elements of its predecessor, while being more balanced, having added unique soundtracks, and overall creating a mostly new experience that, while it didn't completely transcend the original, still managed to stand on the same plane.
Unfortunately, it was a highly emotional experience, with a lot of excitement along the way... so I know I won't rate any VNs I play at this moment fairly, regardless of genre. As a result, I'm taking a week's break from my VN of the Month to recover my sanity, lol.