I don't have too much confidence in simulations of this type, but here's one that suggests that our solar system may not be as common as some would like.
http://www.space.com/scienceastronomy/080807-planet-evolution.html
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Our solar system emerged in surprisingly good order from the violence of planetary creation, according to a new simulation.
. . .
The simulation traces the creation of a planetary system from almost beginning to end, for the first time, and suggests that our solar system started with just the right mass to become a relatively orderly place in the universe.
"You have to have the conditions just right," Thommes told SPACE.com. "They have to be in a fairly narrow range."
. . .
For his part, Thommes remained confident that our solar system was uniquely quiet, especially considering the birthing process.
"What our solar system seems to represent in all of this is a peaceful and quiet form of this process," Thommes said.
http://www.space.com/scienceastronomy/080807-planet-evolution.html
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