A lot of the hate comes from people who played LR1 and liked the game, and then checked out the sequel only to find it has become spreadsheet simulator sprinkled with sexy time. Like having to create the drugs, keep track of all the effects each one does, then keep track of all that across what 30 different characters becomes a headache.
Also because a lot of people view the sex and animations and models as a downgrade compared to the first game since it uses randomly generated models so every thing ends up looking the same
What you haven't mentioned is, that the people are also unable to understand why this is. Vren stated that this game is a project for him to learn programming. It is not about storytelling and he stated at the beginning that he will develop the code as he goes. So it is not surprising that this game is about mechanics and the implementing. It is also not surprising that is has a lot of bugs, as he stated he is learning. If you compare his first versions with the versions now you can see how he developed himselve and his code over the time. (And i will totally take hits for this, in my opinion he has made a lot of progress in understanding how things should work, even if he lacks in the consequence to do it clean).
He was never an animator and if you judge Lab Rats 1 without nostalgie than you can clearly see that he is also not good in writing. Every developer on this site has mostly only one skill, may it be writing, may it be animation or may it be programming. Some has none of this skills at all, but most are learning and getting better.
To have a free 3D Enviroment renpy is the wrong choice to look at if you want it. (I recommend games like skyrim with the right mods for such things ...)
And before someone write that i'am defending Vren, read more of my comments and you will see that i'am totally not happy with how Vren works. So i will not repeat what i wrote in other post from me.
One Point that i have missed, vren doesn't read here. And he reacts on his patreon only to a few persons in my experience, so you should think about that. Everything that you write here will change nothing in the game, this is only to vent the agression and after this you should be calm or considering doing something else if this here keeps you in an angry state.
Have a nice day everyone