few classes

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I disagree.

As far as I know, the general concensus is to take as many credits you can handle. Taking 11 credits and getting a 3.8 is infinitely better than taking 17 and getting a 3.2. Obviously I'm pulling these numbers out of my ass, but you get the idea. Taking few credits is even more acceptable if you have a job and/or if you are heavily involved with EC's or MCAT studying.
 
11 units = part time student

So it's not necessarily a bad thing. Just be sure to account for the rest of your free time.
 
will you be looked down upon by the admissions if you're only taking 11 units?
[If you attend school part-time, you may no longer qualify for the school's health insurance.]

Aside from that consideration, so long as you are otherwise carrying a heavy load (which includes MCAT study that may not be documentable), adcomms take all activities into account before deciding that you're not sufficiently challenging yourself.