I feel compelled to defend the excellent field of dermatology from such slander!
And I would like to point out quickly that if lifestyle is your selling point, you might want to consider PM&R or radiology (also excellent fields) because derm is very, very competitive. There just simply aren't many training spots. If you don't LOVE it, don't put yourself through applying to 60 residency programs!
What's so great about dermatology? It's got surgery AND medicine and you can gear your practice toward nasty diseases or cosmesis, whichever you like better.
It also packs enormous visual appeal...somehow seeing a rash clear up or psoriasis or whatnot improve brings me more satisfaction that controlling someone's hypertension ever could.
Arguing about which fields are "better" is a silly waste of time, but dermatology seems to take more than its fair share of heat from the other guys.
Just answer me this: If I cleared up some guy's grody cystic acne so he could finally, for the first time in his life, score with chicks, while you controlled his high blood pressure (which never made him feel bad in the first place), with whom do you think his gratitude would lie?