For a good overview of Dora Hall musical career, see The World's Worst Records. Not all her records are bad, as Darryl Bullock readily admits :
The difference between Dora and other similar artists is that Dora could actually sing. When she sings kid-friendly songs such as Tony the Pony she’s actually quite charming. Her failings, if you will, become most apparent when she tries to sing pop songs; her vaudeville-trained voice just isn’t right for contemporary music and it’s here she starts to sound ridiculous.
For a Dora Hall enthusiast's point of view, it is better to go to hallofdora blogspot :
Dora created a body of work that is diverse, entertaining, and sometimes questionable [...] The work of Dora Hall is flawed, but it's very entertaining. The fact that she was shooting to become a pop star when she was well past the average age for such pursuits is questionable, but it's made all the more fascinating because her husband (the founder of the Solo Cup company) freely gave her the financial backing to make her dreams come true. Her singing abilities have been widely criticized and dismissed, and yet she's often backed by amazing session musicians. For many people, the draw of Dora Hall is that her song choices and abilities are often just plain bad. If they can get beyond that, however, they'll find a body of work that is charming, enthusiastic, and entertaining in ways that they might never have expected.
Another opinion is expressed by the Left and to the back blog :
There appear to be two popular views on Hall's output. The first is that the woman was dire, couldn't sing or perform very well, and wasted her life pursuing a ridiculous fantasy. The second is that actually some of her output is pretty good with superb production values and some of the best session musicians available (The Wrecking Crew were known to be involved with some Dora Hall sessions).
In this 1966 cover of "I Like It Like That" (Chris Kenner, 1961) Dora Hall, in my opinion, sounds good and absolutely charming.