Wow, that sounds... pretty shitty.
It's weird that the game ended up being so good despite all that BS (according to MapCorians/reviews, I haven't played it). With that development process, you would think that they'd end up with something more akin to Duke Nukem Forever.
I was pretty excited for this game at some point, but that enthusiasm has faded over time and now I'm not too interested any more to be honest.