Yeah Xbox here too and I have never seen them either. I just get the crappy spinning one and the beheading
Pretty much this. The spinning and beheading animations with the sword are the most prolific ones I get. I might get the "run through" animation every once in a while. With axes it's either "over hand smack down" or beheading. Same thing with the mace (unless I don't perk the beheading skill. seriously, how does a mace chop a head off?) then it's just the over hand smack down.
For two-handers, it's typically the same thing. For greatswords I get "run through" and "beheading", for battleaxes it's "face smash followed by beheading" or the "jump, smash" animation. Again, same thing with war hammers (and again, unless I don't perk the beheading skill. and again, another blunt object chopping off heads?).
The only thing I can think of is that you basically have to max out a weapon types perks to see them? I don't know... I usually don't bother since they're a waste anyways.