Versailles grew on me. It's a very livable city with good public markets, a fine transportation system, beautiful gardens and some very pretty architecture in the shadow of the castle (which I have never learned to love).
Two things have had a major impact on the architectural style of the city. The first is the fact that the kings made the rules: height limitations (even today almost all the building are 6 stories maximum), the slate roofs or even the style to be applied to the exterior The second is the lack of limestone in the vicinity. The builders were obliged to make do with a kind of false brick made of "un mélange de plâtre et de chaux teinté d’ocre rouge pour imiter la brique, et badigeonné d’ocre jaune pour rappeler la pierre." (A mixture of plaster and lime colored with red ocher to mimic the brick and whitewashed ocher yellow to imitate stone.) As a result of this your first impression of the architecture might be one of depressing monotony. Look closer because human beings always find a way to express themselves within the limits of whatever framework has been imposed by authority.
The other feature here are the "volets" (the shutters). An older word for these is "persiennes" (my spouse's grandmother was still using this word at the end of the 20th century) and Versailles claims to be the first place in France to have them.
The inventor was one Antoine Duchesne who in 1727 created « les premiers contrevents en lames inclinées, depuis nommées jalousies ou persiennes, par leur ressemblance avec certaines claires-voies des sérails de Perse ». The very first ones were installed in Versailles at the residence of the Marquis de Seignelay, 8-10, rue de l’Orangerie.
Over the windows and doors of many buildings are whimsical sculptures: faces of sad or laughing men or animals like horses.
They are easy to miss but they are everywhere.
And then there is the grillwork on the balconies. From a distance they all look the same but up close you will see a remarkable variety: the curves of Louis XV, and the Troubador and "nouille" (noodle) styles among many others.
And finally there are a few (a very few) buildings that are so distinctive and so unlike the style of all the other buildings that you have to ask yourself who the owner had to pay off to be allowed to build that:
I am a very mediocre photographer and I know the pictures above do not even begin to do justice to what I saw as I walk around the older parts of the city. Happily for you, you do not need to make do with my meager efforts. The city of Versailles has published a very fine Guide des Curiosités de la Ville de Versailles. If you plan to visit the city, read this first, and then perhaps you might be inclined to skip the gilded monstrosity for a quieter kind of beauty.