It's the longer development times and the architecture of developing for the PS3. Here's the proof:
PS2 year one N/A pulled from metacritic. Games published by Sony.
1. Playstation 2: Fantavision (2000) 72
Sony Computer Entertainment
2. Playstation 2: NFL GameDay 2001 (2000) 51
Sony Computer Entertainment
3. Playstation 2: NCAA Final Four 2001 (2000) 49
Sony Computer Entertainment
4. Playstation 2: NCAA GameBreaker 2001 (2000) 57
Sony Computer Entertainment
5. Playstation 2: ATV Offroad Fury (2001) 82
Sony Computer Entertainment
6. Playstation 2: NHL FaceOff 2001 (2001) 57
Sony Computer Entertainment
7. Playstation 2: NBA ShootOut 2001 (2001) 54
Sony Computer Entertainment America
8. Playstation 2: Cool Boarders 2001 (2001) 78
Sony Computer Entertainment
9. Playstation 2: Dark Cloud (2001) 80
Sony Computer Entertainment
10. Playstation 2: Twisted Metal: Black (2001) 91
Sony Computer Entertainment
11. Playstation 2: Gran Turismo 3 A-Spec (2001) 95
Sony Computer Entertainment
12. Playstation 2: Extermination (2001) 67
Sony Computer Entertainment
13. Playstation 2: Ico (2001) 90
Sony Computer Entertainment
14. Playstation 2: Okage: Shadow King (2001) 70
Sony Computer Entertainment
15. Playstation 2: Formula One 2001 (2001) 73
Sony Computer Entertainment
16. Playstation 2: Kinetica (2001) 77
Sony Computer Entertainment
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Now PS3:
1. Playstation 3: Untold Legends: Dark Kingdom (2006) 58
Sony Online Entertainment
2. Playstation 3: Genji: Days of the Blade (2006) 55
Sony Computer Entertainment America
3. Playstation 3: Resistance: Fall of Man (2006) 86
Sony Computer Entertainment America
4. Playstation 3: NBA 07 (2006) 63
Sony Computer Entertainment America
5. Playstation 3: Blast Factor (2006) 68
Sony Computer Entertainment America
6. Playstation 3: Cash Guns Chaos (2006) xx
Sony Online Entertainment
7. Playstation 3: Lemmings (2006) 59
Sony Computer Entertainment
8. Playstation 3: Go! Sudoku (2006) 63
Sony Computer Entertainment
9. Playstation 3: MotorStorm (JPN Import Version) (2006) 84
Sony Computer Entertainment Europe
10. Playstation 3: Gran Turismo HD Concept (2006) 82
Sony Computer Entertainment
11. Playstation 3: GripShift (2007) 67
Sony Online Entertainment
12. Playstation 3: flOw (2007) 71
Sony Computer Entertainment America
13. Playstation 3: Q*bert (2007) xx
Sony Online Entertainment
14. Playstation 3: Formula One Championship Edition (2007) 74
Sony Computer Entertainment
15. Playstation 3: MotorStorm (2007) 82
Sony Computer Entertainment Europe
16. Playstation 3: MotorStorm (2007) xx
Sony Computer Entertainment Europe
17. Playstation 3: Mortal Kombat II (2007) 72
Sony Online Entertainment
18. Playstation 3: Super Rub-A-Dub (2007) 49
Sony Computer Entertainment
19. Playstation 3: Gauntlet II (2007) xx
Sony Online Entertainment
20. Playstation 3: Calling All Cars! (2007) 77
Sony Computer Entertainment
21. Playstation 3: Rampart (2007) xx
Sony Online Entertainment
22. Playstation 3: Go! Puzzle (2007) 62
Sony Computer Entertainment
23. Playstation 3: MLB 07: The Show (2007) 76
Sony Computer Entertainment America
24. Playstation 3: Rampage: World Tour (2007) xx
Sony Computer Entertainment
25. Playstation 3: Championship Sprint (2007) xx
Sony Online Entertainment
26. Playstation 3: Nucleus (2007) 59
Sony Computer Entertainment
27. Playstation 3: Super Stardust HD (2007) 84
Sony Computer Entertainment
28. Playstation 3: Blast Factor: Advanced Research (2007) 74
Sony Computer Entertainment
29. Playstation 3: Piyotama (2007) 71
Sony Computer Entertainment
30. Playstation 3: Warhawk (2007) 84
Sony Computer Entertainment
31. Playstation 3: Lair (2007) 53
Sony Computer Entertainment America
32. Playstation 3: Heavenly Sword (2007) 79
Sony Computer Entertainment
33. Playstation 3: PixelJunk Racers (2007) 62
Sony Computer Entertainment
34. Playstation 3: High Stakes on the Vegas Strip: Poker Edition (2007) xx
Sony Online Entertainment
35. Playstation 3: LocoRoco Cocoreccho! (2007) 71
Sony Computer Entertainment
36. Playstation 3: NBA 08 (2007) 63
Sony Computer Entertainment America
37. Playstation 3: Go! Sports Ski (2007) xx
Sony Computer Entertainment
38. Playstation 3: Folklore (2007) 75
Sony Computer Entertainment America
39. Playstation 3: Everyday Shooter (2007) 83
Sony Computer Entertainment America
40. Playstation 3: Eye of Judgment, The (2007) 75
Sony Computer Entertainment
41. Playstation 3: Ratchet & Clank Future: Tools of Destruction (2007) 88
Sony Computer Entertainment America
42. Playstation 3: High Velocity Bowling (2007) 70
Sony Computer Entertainment America
43. Playstation 3: Uncharted: Drake's Fortune (2007) 88
Sony Computer Entertainment
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You'll see an increase in support for PS3. Most however are PSN games that Sony is publishing. I still think that Sony had a great first year in first party. It's their third party support that dropped off the map. PS2's first year had Metal Gear Solid 2, Tekken Tag Tournament, Silent Hill 2, Grand Theft Auto 3, Final Fantasy X, amongst others. Among first party, it's look a bit equal:
PS2-Gran Turismo 3, ICO, Twisted Metal Black and Dark Cloud with Jak & Daxter on the way
PS3-Resistance: Fall of Man, Motorstorm, Warhawk, Uncharted, Ratchet & Clank Future, Heavenly Sword
Actually it seems Sony itself did a better job on the PS3. Now ain't that a shocker.