....Why is everyone citing 500,000 in NA?
Gears did not sell 2,000,000 in North America. Gears 2 sold around 1,500,000-1,700,000 in NA alone (for the week) with the rest going to Others.
That'd put Resistance 2 at 375,000-425,000 for the week. A little lower than what everyone is throwing around.
FYI: Even if it sold 400k in NA, that's still great. I think Sony fans have their beer goggles on. Very few games do that well on the Playstation 3 for debuts, but have OK to good legs for most games. The PS3 isn't the X360. It can't move the kinds of units the X360 can on Day-1 due to attach ratios and buyer trends, but can make up (somewhat) for it by having legs.
I'd assume this will be the start of Resistance climbing to 3m+ worldwide, which is a very good number for a newer-esque IP.
Back from the dead, I'm afraid.