You have to play it to appreciate it.
On the surface, no it doesn't look especially impressive in terms of graphics and gameplay.
But it's an RPG where choices you make have a massive impact on your game.
Invest points into your "intelligence" for example and you'll open up different /more conversation paths when talking to NPC's which will have a knock on to how you'll complete quests.
Use drugs to give you boosts/advantages in combat situations but you then risk becoming addicted.
Basically it feels like YOUR game rather than just coasting through a story, the Witcher 3 is a lot more linier than Fallout for example.