I'm applying to the MD/MPH program for all the schools that offer it. I majored in public health in college because I thought it would give me a broader education of health than if I majored in biology (not that majoring in biology is bad). I developed a lot of relationships with the public health professors at my university and even had two of them jump on board for a research project I am doing. So like
LizzyM said, public health is definitely good for people who like academic research but clinical rather than bench. From college so far (I'm still going into senior year), the lessons I've learned in epidemiology and biostatistics have been extremely useful, more so than anything else I've learned probably.
Public Health is a bachelor of science (even tho epi, environmental and occupational, and many other public health classes are not considered in the science GPA) that also required numerous behavioral and social psychology courses which helped me tremendously for the MCAT, especially considering I took it before Physics/Biochem/OchemLab. I remember going crazy because I had just taken my final for "Psychology of Eating Disorders" before my MCAT, and I had a passage in the Psych/Soc section on exactly that topic. Keep in mind this section is NEW...maybe they want students to have this kind of background??
When I came into college, Public Health was a new major. This emphasis of public health is spreading like wildfire. For example, many of the top 20 schools I looked at either require or offer supplement courses in epidemiology, biostatistics, environmental, and occupational health (probably more so than before, but I'm not sure). Northwestern and Miami Miller both offer an accelerated 4 year MD/MPH at little extra cost, with opportunity for a stipend. University of Pittsburgh offers the PSTP program (shortened version of MSTP) for students who want more education on clinical science (epi, biostats) and offer the fifth year free with "partial" tuition scholarships for your MD years...not sure to what extent partial means. Stanford has their "scholarly concentrations" many of which are related to public health. I'm discussing their "clinical research" scholarly concentration for their secondary prompt that LITERALLY asks "how you will our requirement for a scholarly concentration help your personal career goals?"
Regardless, I agree with
@Dr. Stalker, you will be a lot more competitive for residency with an MD/MPH. You gain a very valuable perspective on medicine when you allow these to disciplines to INFORM each other through your work.