I'm not fully right to judge as I've played about half of the second I think, but SS2 atmosphere to me it was not.
I was more scared about being jumped by something from somewhere than actually being frightened by the atmosphere.
Maybe it's just the GTE gameplay that takes away from it, but I was more scared of the first walker in SS2 than of any encounter I had. Felt a bit too general. Especially with the "escape sequences" and preplanned non-emergent gameplay.
Also I dislike bossfights, especially those where you have to find the "killspot"
The world wasn't interesting or fun to explore either, but I started from the 2nd part instead of first, so that could have ruined a bit for me.