Alex, I'll take "unemployment rate without the Stimulus" for 16 trillion dollars.
Again, Nothing...
The CBO says teh stimulus created, or saved, ~2.5 to 3 million jobs, in the private sector. That's on top of and separate from the jobs saved at teh state and local government level due to stimulus money that went to the states' general funds. The states were able to avoid laying off teachers, law enforcement, and other employees, and maintain other essential services that would have had to be reduced or eliminated. Those people kept spending thier salaries, helping to keep even more otehr people employed.
It certainly would have been worse without the stimulus, and, even with a few notable and much ballyhooed "failures" (Solyndra, eg., which failed primarily because the Chinese government pumped multiples of what we did into solar, driving the price way below what we could produce the product for...) it would have been better with even more stimulus, as the effects either way feed upon themselves, like snowballs.
As to the missed projections. The Economist, a non partisan, British source of well written news and commentary, and hardly liberal, names several factors that contributed to the jobs rate not improving more, or faster. Among them, uncertainty about oil due to the "Arab Spring", the budget standoff, and the looming "fiscal cliff", even supply problems due to the typhoon in Japan. I don't think The Economist is in the business of making excuses for anyone, so don't even go there.
You got nothin' knot...
Where's the beef?