Something doesn't have to be trite and dreadful to be popular, but often, popular things get this way.
In the 1980s, most of the cars made by General Motors were mediocre, unmemorable and poorly designed. They were also quite popular. By racing to the bottom, GM defended market share but ended up crippling themselves for generations.
Hot Wheels, Spaldinis and the original Monopoly game are classic toys, Platonic ideals of good design and idiosyncratic thought. On the other hand, the hyped toys of the moment fade away fast, because they're designed to shortcut straight to the lowest common denominator of the moment, not to earn their way up the ladder of mass.
Just because bad design and popularity sometimes go hand in hand doesn't mean they're inextricably linked.
The culture of compromise is often accepted as the price of mass. But in fact, this is the crowded road to popular acceptance, and it works far less often than the compromisers believe it will.