Gothic 3 is in good company in my case: Oblivion is my favourite TES, Infinite my favourite Bioshock, I like HL2 more than the original, I think Doom 3 is the best in the series, and even liked Andromeda better than the other MEs except the original.
And Divinity 2 remains the real landmark of the series for me.
I did actually play "Gothic" IV and... I think in conclusion it was just a bit underwhelming rather than truly bad. I remember the pre-release version and being fairly impressed, thinking "this has some potential once they finish it", and then the actual game came out and I realised it was
the finished version. In all its unfinished glory. It was playable, but ultimately it just felt a bit directionless and generally meh. Maybe it got better later, though I suspect not; I simply got too bored to play after a few hours.