Pros
Generally, very good support of employees. Sony does a generally good job of making employees feel valued. Benefits, salaries, support policies, etc, seem better than average in the industry. Also, it is quite multi-cultural, which tends to protect against group-think. Advancement might not be as fast as in, say, a startup, but you can definitely do quite well here. In sum, Sony is a place you can have a solid career in.
Kontras
It's just so big, so diverse, so all-over-the-place. So there are a lot of challenges trying to get the left hand and the right hand to work well together, or even know what they are doing. This is especially true because most big decisions and funding come from Tokyo (HQ), so US employees sometimes aren't clear on what the corporate direction, and what is the basis for some decisions.