As always, the answer depends upon who you are as a person, and your specific academic background.
Plusses of engineering WRT medical school admissions:
1. Not that many engineers apply to medical school.
2. Engineering majors/coursework are/is much more challenging major than your garden variety science/liberal arts major, and ADCOMS know it.
3. You really learn how to learn as an engineering major, as opposed to being able to get by by just memorizing. Granted, Medical School is a lot about memorizing large amounts of information, but you learn to do this more efficiently as an engineer, IMHO.
Minuses of engineering WRT medical school admissions:
1. Classes are far more challenging and your GPA will be lower than most of your applicant peers. You get no quantitative bonus points for this, so your application may be a little weaker on the numbers side.
2. One of the stereotypes of engineers is that they are socially inept, and, this is something that won't fly when you are a doctor. I believe that
LizzyM posted that, in her experience, engineering applicants need to overcome this stereotype during the admissions process.
3. Some schools (UT-H comes to mind immediately) specifically say that they prefer their applicants to come from liberal arts/science backgrounds over "technical/vocational" backgrounds like engineering, business, etc. I don't know of any other school that publicly states this, but for every school that publicly states it, there are probably a few that have it as a non-public policy.
There are certainly other +s and -s, but I don't have a lot of time right now.....
If I manage to get into medical school this cycle, I will be happy to share my experiences. I have 2 interview invites already, so coming from an engineering background can't be THAT bad!
Good Luck to all engineers!
Jota