I disagree; two people or more making a list means the list isn't anyone's in particular, but a result of politics--okay, put him in to make you happy, keep him out to make me happy. I'm never happy with that.
A personal list has the man's prejudices but also his insight; if you're familiar with the listmaker, you know where he's coming from. You also know what he (or she) has to offer.
I've said this before, but I always liked Sight and Sound's lists--not because they have a greatest of all times list (I think that list is useless, except as an indicator of what's fashionable, not of what's actually good), but because they include the list of everyone who contributed. Now those lists are interesting.
I don't look to lists to tell me what movies I should consider great. I look to them for titles I might want to see myself. The more personal lists and the more varied they are, the better.