Socialized medicine is most commonly denounced because the implication is that it will always weigh the cost of care against the value of individual life and make its decisions in a mercenary deterministic manner based upon that cost/benefit.
1. Socialized medicine's highest priority is providing care at an optimal cost/benefit ratio
2. Socialized medicine is forced to cut costs wherever possible and will do so at the expense of the health of a patient.
So, by necessity, it's going to behave like a corporation. Corporate behavior is actually very easy to follow: Provide the least service/product for the highest possible price.