Allow me to include this list I made for another thread...
TOP SELLING PS3 EXCLUSIVES
1- Metal Gear Solid 4: Guns of the Patriots (PS3) First MGS this gen- 2.5 year old game. It was bundled for several months. @ around 5 million ww. Greatest Hit title.
2- Gran Turismo 5 Prologue (PS3) First GT of this gen, although not full-fledged numbered title (sort of like Halo ODST if you will) @ around 5 million ww -counting PSN sales (data from PD themselves)- Greatest Hit title.
3- Resistance: Fall of Man (PS3) First game of this new franchise that was one of the first show-pieces the PS3 had on release date. It was officially bundled in Europe for a good while. @around 3.75 millon ww. Greatest Hit title.
4-LittleBigPlanet (PS3) New franchise more focused on family/young gamers- @ around 3.7 million ww. Greatest Hit title.
5- Uncharted 2: Among Thieves (PS3) Young franchise but still Best overall game this generation according to critical acclaim, awards, etc (hint : it is). @ around 3.6 million ww.
6- MotorStorm (PS3) First game of this new franchise that was one of the first show-pieces the PS3 had early after debut. It was officially bundled until discontinued (the bundle and SKU) in mid 2008. @ around 3.55 million ww. Greatest Hit title.
7- Uncharted: Drake's Fortune (PS3) New franchise and arguably PS3's first killer exclusive. Released in late 2007. Right now it sits @ around 3. 3 million ww. Greatest Hit title.
8- God of War III (PS3) First GOW of this gen, released in March this year- @ around 3 million ww.
9- Killzone 2 (PS3) First game of a franchise that had an unimpressive start in PS2. It also did unimpressive numbers, although still good enough to build upon it and its developing fanbase. @ 2.4 million ww. Also a Greatest Hit title.
10- Ratchet & Clank Future: Tools of Destruction (PS3) The first game of the franchise also released in late 2007 @ around 2 million now.
The only game there that is not a Sony IP is MGS4. Half of Sony IPs are NEW franchises, and Killzone even if it's not "new", I'd say it's real debut was Killzone 2. I think those are very good numbers for new franchises and Sony has PLENTY to build on for the remainder of this generation and the next, including some really exciting franchises that haven't cracked 2 million but certainly will, eventually (and most likely their sequels) like Infamous and Heavy Rain.