Do you think Nina is hot?

Yes

Oh sweet lord yes

Extremely.

She has to be, no other reason for letting her clearly redundant character hang around for so long.

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I'm gonna be a dissenter here and say not really. Liked her character though.

She has a hole and a bullet in her head, looks pretty boney by now, doesn't talk or move and probably smells badly, so no.

Season 1, yes
However, she started to look way to thin later in the years.
By season 4, she was too skinny.