Maybe they should create some more slider bars for face customization and a couple of new hair/beard types.
And hell, have a misc slider for face tattoos, piercings, scars, dirt, make up etc.
But using the same engine, what did you expect, they already created a crapload of character for fallout 3, now they're going to create 2400 characters for Vegas and you expect none of them to look similar to another one?
As long as it's not dead-on clone then I'm fine with it.
(actually, we've already had clones, maybe amata accidentally cloned herself in the gary vault.)