These big IT firms sell a premium on top of what the very best US-based development shops would charge, and then outsource it to the cheapest bidder overseas. It's a scam. I don't blame the overseas teams. They are getting paid a fraction of what they should be. So there's probably a lot of junior developers working on this stuff.
The reality is, in all of them there are teams of amazing, insanely talented people, and teams of complete train wrecks.
It's just life. In any large company, there's a massive variance in ability.
You will see countless examples of companies with no assets, no employees, virtual offices, etc, pulling down multi-million contracts.