1.) Uncharted 1, because it was a new IP, only sold a mediocre amount in the beginning. It kept selling, though, and reached above 2.5m.
2.) I believe it reached this number because of A.) Bundle, B.) Lack of other good games on the system back when it was released, C.) Time (it's been in the market for 2 years).
3.) Resistance 2 sold less than half of Resistance 1 because of those 3 reasons. R1 was pretty much the only real good exclusive the PS3 had back then, was bundled, and has now been in the market for 3 years.
4.) Uncharted 2 could suffer the same way Resistance 2 did. I'm thinking that Uncharted 1's 2.5m sales is just like Resistance 1's 3m sales.
5.) Modern Warfare 2 is on the same release window. Though they aren't in the same genre, people's $60 can only go to so many places. In some places, they can only go to one.
I have Uncharted 2, despite the rave reviews, going for less than 500k first week, much higher than Uncharted 1, because it's a sequel and a fanbase has been created. However, because it's a sequel, the sales are going to be extremely frontloaded because the fanbase will buy early, so I don't expect any legs like Uncharted 1 had. I doubt it'll reach 2m.
(Everything I'm saying is Uncharted 1 = Resistance 1, so Uncharted 2 = Resistance 2)








