I worked as a Scientist (bench) for 2yrs n as a Lab Tech for 2 yrs also @ a Pharma, and I've been accepted to 3 schools as of now. I think it's a plus depending on how u package the experience, u work in marketing so u know marketing is everything. U basically wanna tie all/most of ur experiences into a narrative that concludes with medical school as the next logical step. Everything led to this med school application.
In some of my essay I tied my QC work to patient safety, appreciation of quality improvement in the medical field etc etc etc.
At the very least, its a plus, u maintained a job/responsibility...