Here's the thing, drama/conflict/whatever you want to call it is not necessarily a bad thing when portraying relationships, but it is often poorly done on television. Most TV couples end at the drop of the hat because the writers think it will make the show more interesting.
While the "Will They/Won't They" cliche is pretty old, I do wonder what it says about our society. At somepoint the writers started looking around and realized that with the high divorce rate, there are probably fewer June and Ward Cleaver's than there are Al and Peggy Bundy's or, for the single set, Ross and Rachel's.
Personally, I enjoy watching a couple that deals with problems, but stays together, than one that is constantly going through the cycle of love/hate/friendship/love/hate/friendship, ad nauseum.