The whole story is a bit hard to untangle, but I wouldn't be surprised if both that he literally saved Nissan and funneled money off to personal projects is true. He strikes me as the type of executive who believe he can do what he wants as long as he shows result. It was rumoured that the house he lives in in Beirut actually belongs to Nissan and they've been trying to get him kicked out, but with little success.
Nissan may have been saved, but it came at the cost of their reputation. According to my auto mechanic friends Nissan once ranked up there with Toyota and Honda for reliability, but their quality plummeted after the Renault deal.
Nissan went to crap when they took a controlling stake in JATCO and started using those god awful CVT's in everything, and then stopped putting any effort into their sports cars to keep them competitive enough to lure enthusiasts to their brand. I owned a GT-R for several years and it was a great car, but it's going on 13 years of the same generation and the 370z is hardly any different from the 350z that first came out in 2002. I could rant for hours, I used to love Nissan. I'm hoping the 400z will turn things around for them in the eyes of enthusiasts if it's priced reasonably.