I would not expect Matthew and Sam to behave the exact same way, for example. Or Damien and Erik. Getting the same breakfast notes also made me roll my eyes a bit, I much preferred the ribbon notes that were changed to match their personality.
And I have to agree about Andrew's route being a bit out of place, too, even though it did provide more variety. I liked him as a character, but in the incubi routes he just poofed in and out.
I loved the voice acting though. It added a lot.
My favourite routes were Damien and Erik, which, (maybe not so coincidentally) I played first. When I first saw them, I expected I wouldn't like the two redheads, and they ended up being my favourites.
Matthew was cute too, but by then I'd already read the same things three times. His killer bunny was just... priceless. The only one whose route I didn't really like was James, which was a surprise to me. I even liked his voice actor a lot.
It's a shame Mika doesn't get to know the truth about her grandfather unless you play specific routes.
Still. Lovely game, especially the first time around. (DAMIEN) I also had no idea what the password was, silly me didn't think of