YANBU. I think most people expecting a baby expect a certain amount of disruption to their sleep through night feeds, etc but I also think there's lot of crap-yet-well-meaning advice out there too which clouds expectations. When DS (my first) was born I had several people tell me he needed rusk in his bottle to "top him up because he's a big lad", there is also a poster at the baby with clinic that says if your baby is not sleeping through by six months you should speak to the HV for information on controlled crying 
I also think it swings both ways though and some babies do sleep through. I was very, very, very lucky that my two slept. I don't know why they did or how, it certainly wasn't down to anything I did or didn't do, they were just lazy I think! DS from newborn would go down after a feed around 7pm, then he would wake around 11pm-midnight (ish) for another feed. I would go to bed as soon as he finished that one. Then he'd wake around 3-4am for a feed then sleep until anywhere from 7am to 9am (depending on the time of his last feed). When he was 6wo he dropped the 3-4am feed himself and slept through from 11pm-ish to around 7am-ish, he started wanting an extra feed during the day instead (demand fed) so I just went with it and he slept around eight hours every night.
DD followed a similar pattern - feed around 7pm, down, then she would wake around 9/10pm for a feed then again around midnight. As soon as she had her midnight feed I went to bed, she would then sleep until around 7am every night from day one. She never once woke for a night feed and when I asked the HV if I should wake her I was told no because she was growing/gaining weight, she was giving plenty of used nappies, and she was feeding lots during the day and evening (and was very vocal when she was hungry) so was obviously getting enough - it also busted the myth that breastfed babies don't sleep as much as formula fed babies 
I'm due DC3 and I'm hoping he's just as lazy and I get lucky a third time but if I don't, then I don't.