The game was solid from launch. When a game is an offline, single-player game, with no future content planned, and good QC from the get go, you don't need a whole lot of updates. You just need to fix the bugs that pop up when the general public with their wide variety of hardware/software configs and gameplay styles that weren't tested for get their hands on it.
The one thing it can't be criticised for as I understand it is polish. I've heard many complaints about almost everything else, but as far as technical matters it seems to have shipped very well optimised and largely bug free - a welcome change from what we've grown accustomed to.