There is way uglier out there.
Most of these churches at least had a bit of character, even if that character was all wrong.
A number of churches-- cathedrals even-- are just drab.
There's nothing to them.
Perhaps that's why they got overlooked.
My pick is the Cathedral of the Immaculate Conception in Burlington Vermont:
I also think la Cathédrale Ste-Anne in La Pocatière should get a mention:
I get that some parishes are poor, so it's a bit unfair to criticize the esthetics of their church. I used to attend a church that was created out of a former bar. It didn't look too bad, but it would be unfair to compare it to a 17th century baroque church.
But some churches are deliberately designed ugly. And it's not a question of money.