On McMansion Hell [1] one of the common criticisms is the mismatched windows. Aesthetic considerations aside, having mismatched windows can be a maintenance issue. One example might be hurricane shutters for homes along the Atlantic and Gulf coasts---if all the windows are of the same style, it's cheaper (or easier) to obtain the proper shutters (you don't have to obtain six different sizes) and eases installation when required.
Complex roof lines (another symptom of McMansion Hell) leads to leaky roofs [2] and expensive repairs.
[2] Frank Lloyd Wright's houses notoriously leaked along the roofs. When called upon it, he is recorded as having remarked, "That's how you tell it's a roof!"
I just laughed out loud because I have never heard of the term McMansion before but every single house that I have been seeing go up in Dallas lately fits that description so elegantly. They do look like a mish mash of wierd things but when organized into clusters of hundreds its somewhat normalizing to see them all so wierd.
Complex roof lines (another symptom of McMansion Hell) leads to leaky roofs [2] and expensive repairs.
[1] http://mcmansionhell.com/
[2] Frank Lloyd Wright's houses notoriously leaked along the roofs. When called upon it, he is recorded as having remarked, "That's how you tell it's a roof!"