It wasn't only the poor testing of the patch but also PI's caving in on a lot of issues to some of the more vocal members of the forums on numerous things like how the game was broken because it wasn't historic enough. (note that THEY determine what is historic and what isn't of course)
I will never blame a devloper for listening to the people that play their game (I know I'm very opinionated today). It's so much better than them listening to some big wig exec that's never played a game in his life and thinks he knows what the "next big thing" is. Please PI continue listening to us. We might not agree on everything but it's better than the alternative.