I'm using it almost exclusively for VR, so I'm comparing them to other VR sex games.
Played using Index.
Is there real gameplay in this game? Not really. Technically you can go to different rooms that have girls, and based on positions you have sex in, change their predispositions. In VR there's not even that, it's just the sex scenes (pick the girl, male model, room, girl mental state and off you go). The interactivity in VR is also partially limited; yes, you can grab boobs, ass, finger the pussy; there is little to no interactivity with the clothes (can't grab, roll up, or take off). All of those actions have to be done through menus you have to open and "hang" in VR space.
The "possession" aspect is also limited to your head, and it's not actually linked to the body. While there are controls to easily reset the position and view direction to the male model, you can always move around. The nice thing is that if the camera is close to the head, the whole head disappears, so there is no issues with clipping (it does make your shadow headless unfortunately). You can easily clip through girls or environments, which while immersion breaking, is a more ergonomic solution (as moving the world around you so that you don't clip is nauseating).
So, why the high score? It's basically one of only two VR sex games to which I come back to over and over again (the other being Koikatsu/Koikatsu Sunshine).
The amount of clothing options is simply overwhelming. The customization options for those items are also huge (it's possible to change the shaders and shader settings used for particular pieces of clothing!).
The character editor is both incredibly powerful and easy to use (leagues ahead of what Virt-a-Mate has). Even if you can't find a character card with your particular kinks, making the girl (or boy, you can make the character have male characteristics and a penis) with a different body type, like with thick thighs, big boobs, or totally flat with skinny legs, as long as it's not too far from the original card, will require changing just few well labeled sliders.
Yeah, the ready-to use character cards... There are literally tens of thousands of character cards, ones that include famous actresses (both mass media and porn ones), game characters, "realified" anime or cartoon characters, and original characters. There's everything.
If I could give fractional ratings, then this would be 4.5/5, but only because I find Koikatsu better: HS2 aims for realistic look, but doesn't quite achieve it. Koikatsu aims for anime look and gets it. Koikatsu cards can also have multiple outfits, so for established characters it makes it much easier to switch between them. For consistent, reliable, and ergonomic VR experience that's not repetitive, I have found nothing better, but Koikatsu, and that is only marginally.
The only thing that even is on the same planet, let alone ballpark, is Virt-A-Mate, but that thing is a usability nightmare and has much fewer clothing and ready character options.
I probably should also mention that it has a scene editor, but then if you've seem more than 3 Ren'Py games on this site, you'll be familiar with either HS2 or Koikatsu editor output already...