ah okay,  i was wondering with the actual average being 75.6.  

Has any system in the last decade had a killer app at launch though? Even then, how many system before that were fully equipped with a killer app at launch?

I think anyone with rational thinking figured that out that was the real reason already, i just find it ironic that it seems the PS4 has a considerably worse launch line-up than the PS3 (y'know, PS3 haz no gaemz, and stuff), but is getting considerably less hate than the PS3, gee, I wonder why, lol.

74 now, maybe it'll reach the 75 psychological (green) barrier.

But I think it won't reach my 80 prediction.

BTW 74 is not a flop.

EDIT: without the biased Microsoft funded Polygon review the game may be already a 75. BECAUSE they gave Knack a better score than KZSF. What a joke of journalism.

Focusing on exclusives and new games...

Well, the Wii is the best example. Armed at launch in 2006 with the twin killer apps of Wii Sports, which would go on to become the most popular retail game of all time, and Twilight Princess, a game with very high reviews that generally praised its unique controls.

Other examples, though more arguable, include:

• The DS, which launched with Super Mario 64 DS, which is today the best selling handheld 3D platformer of all time, got good reviews at launch, showed off the DS's 3D prowess and touchscreen, etc.
• The PSP, which launched with Lumines and Hot Shots Golf in Japan, and Ridge Racer worldwide. Hot Shots Golf was one of the few early PSP games that actually succeeded in Japan, Lumines was a highly rated exclusive suited for a handheld, and Ridge Racer was a pretty solid hit worldwide.
• The 3DS launched with Nintendogs + cats. Now, that series has definitely dropped this generation, but over two and a half years later, it's still one of the top few best-selling 3DS games worldwide, and especially in Europe.
• The Wii U is a bit weird. Nintendo Land and New Super Mario Bros U have sold very well for a game on a nearly failing system. They might not quite be killer apps, but without them, there would be virtually no Wii U's sold. So that at least makes them system sellers.

The 360, Vita, and PS3 admittedly lacked killer apps at launch, but having a killer app or at least a system seller at launch still seems to be the norm, if only because of new tech and awaited new entries in popular series.

In contrast, the PS4 apparently has virtually no high quality major exclusives at launch. A downloadable twin stick shooter is great, but I doubt that's what's moving hardware.

The Xbox One, much as I hate to say it, at least seems to offer more unique major games. Bleh. Seriously though, Dead Rising 3, Forza 5, and even Ryse all have the potential to be system sellers at least.

Indeed.

Name any medium where critical acclaim directly correlates to financial/sales success.

One more?

Critical acclaim most certainly affect sales. Heavy rain sold well (legs) because of critical acclaim and great word of mouth. Do you think Beyond would have sold better if it had a 90+ on meta critic and everyone loved it? Yes. 

While individual reviews are just opinions, people look at them for that final decision to buy a game. Not always, and obviously people will still buy Killzone, but the quality does affect the sales. 

Didn't we already know that PS4 would have more FLOPS than the competition?

Vita had Uncharted: Golden Abyss, which is the #1 retail game on the platform. That has to count for something.