The HOR, on the other hand, does seem to occasionally get nominees who got the nomination on their own merit.
JMHO
I am talking about prior to the passage of the 17th Amendment. If you pick up a history book the reasons cited for the 17th Amendment were corrupted state legislators.
In pre-17th Amendment days influencing the people was still important. The Lincoln-Douglas debates was not to crowd of legislators but to a crowd of ordinary people who would influence those legislators.
Other then that, I am not quite sure of your point.