This show was so good because it dealt with a teenager with an extremely high IQ who's a Doctor. If that wasn't hard enough, Doogie had to deal with social issues throughout the shows four year history.
Doogie always had to put being a Doctor first before hanging out with his friends, being interrupted at school functions and leaving his girlfriend Wanda during a date, due to being called to the hospital.
This was one of my favorite shows of the 1990s. Being smart and having an extremely high IQ and graduating from college at 16 has its pros and cons.