I recently had a flexible resin partial made to replace an old one with metal clasps which showed and was ill-fitting due to changes in my mouth over the years. Because of missing buds, there are teeth missing on both sides of my lower mouth. I had high hopes that the new partial would be functional, look natural, and also look GOOD. I have been disappointed on all counts. The tooth units are small, and shorter than my natural front teeth. Not a good look, and having difficulty chewing my food. Is that the best I should expect, or could the tooth units have been made larger and taller?

I would go back and tell your dentist you're not satisfied. Explain what you just said here and say it's upsetting to you since you had high expectations for having a charming smile with even teeth.