I bought a Raleigh Alyeska with a severely bent derailleur hanger. I tried to straighten it myself, but could not get it shifting right. Ended up taking it to the LBS. The Mechanic who helped me said the hanger is "very soft" and would easily bend again. He also said it would probably break if it has to be straightened again.

Does this sound reasonable. I thought forged dropouts were more resilient then that.