I'm fairly critical, so there's not too many on my list, but the biggest one is that I liked Quest 64 (somehow) when I was younger.
I also love La Mulana 1&2, along with Deadly Premonition, though those are more "cult hits" aka critical failures that 'widely disliked'. But, I'd definitely hesitate to recommend any of them to someone unless I thought they'd be into it.
Same here tbh. Darksouls 1's strongest point is the first couple of areas as you search for the bells but drops in quality sharply post Sens, meanwhile Darksouls 2 has rough maps but nothing on the sheer unfinished scale of Lost Izalith.