My observations:
Bayonetta was supposedly another Devil May Cry clone and since we all know how Devil may Cry 4 turned out, people were a lot more skeptical about a day 1 purchase this time around.
Bayonetta would have done a bit better on ps3 had the word of mouth not spread about how horrendous the ps3 port turned out to be. I know I would have added 1 to the # of ps3 coies sold if not for this
Darksiders has the big muscle guy that is typical of the heroes Americans love so maybe data from other regions would offset this in Bayonetta's favor but I'm not entirely sure since bayonetta seemed to have flopped in Japan as well (note that the JP flop could be due to option 2 since ps3 is a lot more relevant than 360 in JP)
Ultimately, the "others" numbers will clarify everything
"Dr. Tenma, according to you, lives are equal. That's why I live today. But you must have realised it by now...the only thing people are equal in is death"---Johann Liebert (MONSTER)
"WAR is a racket. It always has been.
It is possibly the oldest, easily the most profitable, surely the most vicious. It is the only one international in scope. It is the only one in which the profits are reckoned in dollars and the losses in lives"---Maj. Gen. Smedley Butler