Argonians were great in Oblivion but in Skyrim they seem uglier than they were.
Aesthetics obviously vary from person to person, but I've got to disagree with you on this. o.o They have much more harmonic facial compositions in Skyrim.

Another plus is that they don't fall nearly as close to the uncanny valley as the human characters. This is totally an attempt to get back on topic here - if I can play as something that has a non-human face, I usually will. (Then comes the gender selection...)