YES. For one, I'm having problems on a 3 month old MBPr. I have to reconnect the charger up to 3 times before it will come on. Not worried, I have lots of warranty.
I was too cheap to buy a new charger for my 2010, about a year ago. So I "fixed" the one I had. I had it charging and the wires touched and shorted the charging port. Go one for ten bucks and am good with REALY fixing these things so I was ok. Ended up just buying a new charger. Ten dollar mistake...