Well if we want to get specific, Diablo 3 hasn't been updated in any way on the pc since may. So yes I think they can do better. That's rather long for a game deemed unfinished by its player base. Another example is GTA 5 shipping with it's online broken, or Rome Total War. Most big title games are shipping these days with some glaring issues, or straight up broken in some areas. It's become somewhat accepted in the industry that they'll patch in what they haven't finished, or what isn't working. But what's wrong, or not wrong with these games is not the point of this post.
I don't think Muse has anything in common with large company producers, and that's the point. Muse has produced and manages a game subjective to the scale of their company. They haven't overshot. They have a small team of eight and their game reflects the boundary of how much they can make, while making it right. Adventure mode could be out, and not finished, but its not. It will be out when it is ready, and we all know that, because we all know how meticulous Muse is. We have a game that's been run like a well oiled machine. The devs are listening to their community, fixing servers, and in balance issues with lightning speed. Every month has a big patch. They have a hunger, passion, and drive to make the best game they can with what they've got. If they had a massive studio with a hundred employees, I bet the quality would still be the same. That's the point. They are the model of what a gaming company should act like, and I wish other big companies with their luxuries had that hunger and passion.
