What makes a Star Trek ship design unconvincing

What is the panel's least-liked Star Trek ship design, apart from the commonly criticized Oberth class?

Choices include the Chariot, Olympic, Defiant, and Constitution designs. Reasons vary between personal dislike of their shapes, inconsistent scale, and a reputation considered greater than the design deserves.

The fan-designed Chariot class attracts criticism for its vertical layout and the position of its nacelles. Spherical primary hulls prompt objections to the Daedalus and Olympic designs, although the Daedalus receives a more forgiving response. The Defiant produces a different complaint: it can be both a favourite and a least favourite because its apparent size changes between appearances. The Klingon Bird-of-Prey raises a similar scale dispute, including disagreement over whether different variants explain it. The Constitution class is criticised as overpraised, with Enterprise's success attributed to its crew and other contemporary designs preferred on appearance.