Yea I'm pretty hooked on it myself. Playing on PS4 and I think I'm level 18. I'm a huge fan of 3 (one of my favorite games of all time) but didn't love NV quite as much. 4, though, really has it's hooks in me. I wish I just had more time to play.
So far, I feel like 4 is really just an extension of 3. There are a few changes and updates, but overall it feels like more of the same. Which imo is a good thing. There's just something really satisfying about forgetting the quest log and just wandering the wasteland, exploring. I played Skyrim too, which is similar in that regard, but f*ck that game was just too big. I felt like I was never making any headway and I just finally stopped playing it cold turkey. Fallout 4 is expansive but doesn't seem overwhelming yet. It's also been rock solid on PS4 - no crashes or game-breaking bugs. Let's hope it stays that way.