I hate when this gets brought up, because it inherently implies that we can't improve them. Everyone talks about increases in handoffs causing increases in medical errors. I think handoffs have a long way to go, and we need to better utilize technology to help in this (ie make better EMRs).
The overworked doctor is just as bad IMO. I've been there on solo 28 hour calls going on my 11th admission. In the morning I'm next to useless and my handoff to that team was less than stellar.