Bodom is NOT that unique, compared to some bands... like, say, Meshuggah. However, imo, Meshuggah suck ass. Uniqueness isn't always a good thing. CoB has made a unqiue combination of ideas that isn't easily duplicated but very easy to get into. It's catchy and heavy, and it flows seemlessly together.
I disagree with ppl who say Bodom and Norther and Kalmah are so much alike blah blah blah... they are three completely different bands, and like the dude said, just cause you've got a growler, skilled guitar and keyboard players who like to solo, and they have similar musical inspirations, does not mean they are rip offs. Plus, I've never seen a band use so many of other bands' riffs and melodies as CoB... so if anyone complained it'd be a double-standard, since I've never heard anything in Norther or Kalmah taken from other bands, and never heard anyone bring up anything like that about them (although I haven't heard all their shit so I can't be sure).
Aren't Norther and CoB are from the same town? And some of them were friends or something? Maybe I'm wrong. I thought I read something like that in an interview.