It's been some time since I've been so hooked to a game I was eager to return home to play it every day until I completed it.
I fortunately didn't suffer from any bugs during my playthrough (I got the game after it was officially launched).
If you play it, try to not check any forums or wiki so as to not spoil any of the experiences, unless it's your last resort. Everything will come naturally before you know it, and even if it doesn't that's part of the experience.

The game features a main plot while you progress in exploration, crafting and upgrading your character in an amazingly seamless way.