She looked great in X2, but the soccer mom look both she and Halle were sporting was sooooooooooo trendy for that 2002/2003 time period. It looks dated already. It's too bad they didn't stick to more classic looks for that film.
But I agree Famke's X2 look was her most stunning turn as the Phoenix. Her hair in X3 just...pissed me off to no end. It was clearly just sitting on her head, and begging to be tugged off easily. It was about as bad as Jessica Alba's in the second FF film.
FOX's make-up dept. do not excel with wig selections. Ever.