Well, I suppose that's true of any animal, but it doesn't seem to be particularly common to hedgehogs, as far as I've read. Astrid is anything but aggressive. But, she also came from a breeder who made a point of frequent handling. I think their natural tendency is to be scared and their usual defense is to roll up into a ball, (not to charge and attack) so they are usually less aggressive than most animals because of the opportunity to use their quills as protection rather than their teeth. (actually, the tenret? However its spelled, they're a close relative of the hedgehog, the ones you see with the longer ears, They are known for being more likely to charge and bite than to roll up)
The big problem with hedgehogs, even ones from great breeders, is that, especially when they are first woken up, they are very easily spooked, so they can roll up or half up and puff up their quills at the drop of a pin, any sudden hand movement, clearing your throat, etc. - and those quills can really hurt! your hands. So, a lot of people aren't tolerant of that, so they handle them less and less, and the problem becomes worse and worse. So then an Un-handled hedgehog eventually has to be handled, for this reason or that, cage cleaning, baths, nail clipping is the big bad one.. And if they can't ball up, and theyre scared then what choice do they have as a defense? Maybe that's where you hear about the aggressive ones?
Also, as far as biting goes, I don't usually hear about defensive lunge-biting, but what you do hear certain warnings about is to watch what's on your hands - hedgies are very scent-oriented, so sometimes they will really dislike the scents of certain soaps or lotions, or nail polish is supposedly another common one. The opposite is true too, if your hands smell too good, like food, be prepared to be treated like food. They also will warn you (as do breeders of gerbils, and sugar gliders) that if you're feeding them something don't let them lick your finger clean because when the food remnants are gone, they'll try to nibble your finger to get more food to come out. So basically a good practice is to wash your hands with a familiar soap that they dont mind before handling them and you should be good.