We had an ugly tree. It was a larch (aka tamarack), and looked like the one in the foreground of this picture:
I know it looks kind of majestic in its natural habitat. In an urban front yard, though, it just looked aggressively large and menacing (it was over 50 feet tall, when we finally paid to have it chopped down - about twice the height of our two-story home). It was a conifer with a spiky, peeling trunk, sickly yellowish-green needles and, as a bonus, it would drop those needles every fall, making it even uglier. It was a deciduous conifer!
Plus, unlike the tree in the photo, our tree would push out branches all the way down the length of its trunk to the ground, meaning we had to keep chopping them off in order to have any accessible front yard at all (they would even grow across the walk leading to our front door). It also made the soil so acidic nothing would grow underneath it, not even weeds, which meant our front yard would turn into a mud pit every time it rained.
Definitely an ugly tree!