George M. Middius said:

Hideous? To me they look bland, just another face in the crowd. Which
ones appal you?

The Sixes series, for instance.
Though they're about 10 years old, now.

If you want to go into the "monstrous" part, that would be interesting.
It's been a while since I heard any. I recall a single-driver bookshelf
type. It had typical English sound, mellow and laid back. Probably long
discontinued though.

Especially the ones with the "coaxial driver" sound horrible when
listening slightly off-axis.
But not as horrible as when in the sweet spot. They'll sand-blast your
ears off.
I've seen this driver in almost every Tannoy product I've encountered.

Now, the old Monitor Reds, that's a different story. Ugly as hell, but
very pleasing sound. And LOUD!
I've heard these in a studio some years back, they were driven by
QUAD II tube amps. My ears still ring.

--
Sander deWaal
Vacuum Audio Consultancy