SOMA has a lot of potential. But 3 things make it so I can't enjoy the game: 1: The protagonist reacts to life-changing events as if they are minor inconveniences. He's also a bit dense, and always asks really obvious questions. 2: Enemies patrol in circles. Stealth gameplay is just a ring around the rosie. Hope you like hiding in corners for minutes at a time. 3: Enemies just become boring or tedious after a while, even if they are supposed to be scary. I love the environments, audio, and overall feel of the game. The philosophical narrative was interesting. But the issues above simply stop me from wanting to play.
This game makes you backtrack a lot. Be ready to drag back and forth in the same corridors for hours. I'm 18 hours in the game and have given up at the executive level. Finishing the groves was a chore. Now I have to fix a relay modulator and after spending an hour looking for the one broken modulator, I just can't play anymore. Stay away, it's not worth it.
I would get it on sale. Expect about 6-8 hours of fun. Enemies and levels are quite similar, even if levels are proceduraly generated. Gameplay feels good, but 90% of the time you hold down mouse 1 while running circles around enemies. There isn't really a story to speak of.