Well, I may have read this in a past thread at this site, so don't flame me if someone already said it a long time ago, but I read that when the Hueys were first coming into service, there was some type of flaw where if you maneuvered the helicopter a certain way, the main rotor would detach. They lost a lot of pilots through that until they picked up on the problem.
I also read the Apache attack helicopter was a crappy flyer because of something screwy with it, which they fixed, and also the Blackhawk helicopter, now one of the finest helos out there, was a true "Crashhawk" at first due to some mechanical glitches they had to fix.
From what I have read on the Osprey, it seems cool enough to me. And the media always hates new aircraft. Back when the F-15 was coming out, some went as far as saying that it was a pointless aircraft that would be no match for the competition's jet aircraft out there. And the Apache was highly critized too, until Desert Storm.