Let's face it. A lot of his chairs don't look very comfortable.
For a time Wright fell in love with plywood and used it to make visible walls even in his upscale houses, something few modern architects would do.
A more serious problem is his lack of interest in bedrooms and kitchens.
Here's (above) a Wright bedroom. It's a living room with a bed in it. Taken alone it looks great but imagine a whole house where every room is a living room...it's just too much of a good thing. I see homes as a confederacy of different moods and purposes, the way nature itself is.
Here's another bedroom. It feels like a family room or a study that's doing double duty.
Here's a kitchen that also looks like a study. You get the feeling that the man never spent much time in kitchens.
Lots of people think of landscaping as an art form but the subject seemed to bore Wright. All he seemed to want around his houses (above) was a nicely mowed lawn.
His low-budget Usonian houses seemed all the more stark and unappealing on the plain lawns.
Does anything I mentioned diminish the architect's stature in my eyes? Nope. Not a jot. He's still the greatest builder of homes that I'm aware of. I only mean to point out that nobody's ever perfect, not even the greatest geniuses.