Asking questions in article titles, like "Did Nvidia break....?," instead of outright claiming "Nvidia broke...," sets off my internal BS alarms. The use of quotes on "break" is also questionable. It might just be dramatic flare, but it is not proper Journalism. I know; it's the internet and I'm asking too much here, but this is the kind of stuff partisan hacks, masquerading as serious news journalists, engage in.
Also, how did Nvidia "break" DX10.1? If they influanced devs to no support it, fine (well, not fine, but yeah), but I'm note sure that counts as "breaking" anything. As far as I know DX10.1 still runs fine, just isn't supported in AC.
I'm just gonna be contrarian from the general feel of this thread and shift some of the scorn onto Ubisoft. AC isn't the worst port of a game (a distinction Ubisoft, however, holds with another title) to the PC but it is far from perfect, and only clumsily manages adequate. DX10.1 support doesn't really add much to an already sub-standard PC game. If it were a better PC game, then I'd have more sympathy for those screaming foul; but as is I just can't get worked up about ACPC.
And I'm sure there's some way to blame M$ for all this as well, but I've lost the will.