When a show has more than 1 or 2 seasons, it is highly possible for it to be less executed, but that is the opposite of what Dr.romantic is! The more, the better.
This show never failed in many ways, it is extremely well executed, the acting is superb, the story line is well written and the character building (which was my fav part) was realistic and perfect.
I really hope that it will have more season as there is high potential to make it even more successful by adding all the 3 seasons characters in one.