Maybe it concerns only my practice...
Last time I almost do not see dread knights in my games. In some game I saw a dread knight in my opponent's army and I told myself: "Wow, this is a first time during a long period I see this hero class!". So I think it shows this hero type is downshifted and players vote againt him choosing another heroes.
DK is rather like paladin. He has chaos instead of leadership, and he is ery slow (cannot increase his speed), and he searches ruins worse than paladin. Yes, he could achieve chaos 18. After a long long long practice. I laugh remembering a horse lord who could get L=25 having only level 4. He has something more, but I think it is not enough now when we could get a barbarian, a horse lord or an assassin.
Is my obseration really correct?
What is your experience?