Why do people keep claiming MGS4 is PS3's saviour?

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ssj12 said:
Your missing so many titles on the MGS franchise... MGS3: Subsistence.. where is it?

 All of the other titles sold far, far less than these three, which is why I didn't show them. But, if you would like; Here are all of hte MGS titles released on a PS system. This just displays my point further that MGS is not a system seller.

Pos	Game	Console	Publisher	Hits	Score	Sales
1		Metal Gear Solid		Konami	9,770	7.82	5.59m
2		Metal Gear Solid 2: Sons of Liberty		Konami	10,587	7.85	5.56m
3		Metal Gear Solid 3: Snake Eater		Konami	13,714	7.87	3.97m
4		Metal Gear Solid: Portable Ops		Konami	4,799	7.72	1.04m
5		Metal Gear Solid 3: Subsistence		Konami	4,289	7.60	0.47m
6		Metal Gear Solid: Portable Ops Plus		Konami	2,249	7.78	0.28m
7		Metal Gear Solid 2: Substance		Konami	1,708	7.30	0.16m
8		Metal Gear Solid Integral		Konami	397	7.55	0.10m
9
10		Metal Gear Solid: The Essential Collection		Konami	595	10.00	0.05m
11		Metal Gear Solid: Digital Graphic Novel		Konami	403	7.58	0.04m
12		Metal Gear Solid 20th Anniversary: Metal Gear Solid Collection		Konami	899	8.41	0.03m
13		Metal Gear Solid Comic Book		Konami	442	8.19	0.00m
14		Metal Gear Solid 4: Guns of the Patriots		Konami	37,614	8.01	0.00m
15
16
17		Metal Gear Solid VR Missions		Konami	618	7.56	0.00m
18
19		Document of Metal Gear Solid 2		Konami	238	7.79	0.00m