Most of it is just your average day anti-capitalism propaganda. I feel sorry for those people who lost their jobs, but if they were so (cost-)productive and the companies so profitable the companies would either still be there, or new companies would have been started to profit from the skills of these people. I have no information on these companies or Bain capital, but I'm going to go out there and say these companies were heading for bankruptcy anyway, probably because the employees had gotten too expensive (thank you government endorsed unions!), and Romney just did a good job for his investors in finding the most profitable way to sell the assets. A profit that comes at the expense of the former owners of the company by the way, and no one else.
The part about insider trading does seem sketchy, but there is really no verifiable information on it let alone proof, so I think you should take that with a pretty big grain of salt. If true, this does say a lot about Romney's character though. I personally think Romney isn't a bad guy, just grossly misinformed. I think the campaign is doing the right thing in criticizing this attack, or at least handling it very cautiously. If the campaign did endorse this ad in some way, it would surely backfire in a major way in the general elections since naked capitalism is exactly what RP propagates. Talk about hypocrisy...
As far as below the belt hit pieces go though this is surely a good one, and it will hurt Romney if it gets out there, which is good for us. So be it. Ron Paul 2012!