It's a masterful experience for what it is, using its simplicity quite effectively in its horror. It's no coincidence that so many games spawned off its promises both fulfilled and not.
Simultaneously, I think people get very ahead of themselves when talking about this game; calling it the greatest survival horror in recent years (and now some making the claim best of all time) feels like a stretch borne of rose colored glasses and how inaccessible it has become now.