I agree; Doralhyde was much more 'frightening'. For me it's not necessarily that he's more realistic, but he was just so different, for me. I'm not sure what it was about him. Buffalo Bill was different, but I was more 'amused' by him than anything.

Lecter, however, does seem pretty "real" to me. A wee bit exaggerated, but still. Maybe it's because I've been tenativly diagnosed with anti-social personality disorder.