I loved the Juggernaught and I loved little Kitty Pryde beating him.
And of course Famke Jannsen, but she could look hot wearing hobo pants, hell in this franchise she already has
That being said, X3 didn't really stand out as a sucky movie for me. In my world there's the first and First Class 1 and 1a respectively, then X2 then all the rest including Days pretty much tied. Call me a weirdo but I just can't drink this summer's cool aid. Days was heavily flawed.