You raise some interesting points, but when the Atlas Era comics are considered in relation to the offerings of other 50's publishers, then you can see they weren't any worse in terms of content or art.

The only exception to this is the EC New Trend line - where art and stories were truly outstanding for that period.

You have to look for some other reason for Atlas not doing well. Superhero comics were generally in decline and I don't think the Atlas heroes were as recognisable as DC's (not even Captain America, who was primarily a war hero, and the atmosphere had changed with the Cold War). DC was struggling anyway. The 50's was realy the decade for Sci - Fi and horror and the Atlas books on those themes did better, even though the the same talent pool was used as on the Heroes books.