I didn't have any bugs in my first 7 hours or so, but the more I'm into the game, the more gameplay feels like Fallout 3.5, rather than something that would justify the 4 in the title. (And no, I'm not the NMA type.) Sure, it's nice to see proper shadows everywhere, and physically-based rendering is always welcome. Still, things like awful character animations are here to stay, and the player movement model is something they haven't touched probably since Morrowind. The main story seems as cringe-worthy as in F3 (and similar to), writing and voice-acting is between average and mediocre, and quests are a typical fetch-kill thing.
Sure, there is this sense of novelty and big world to explore, but that wears off. And nothing screams confidence like 'let's put The Sims/Day-Z stuff to distract players from other sucky things we did'.