And I think you fail to understand that the characters in Diablo 3 are not ordinary humans. They are nephalem, a race more powerful than the angels and demons; and we don't know the limits of their power. So you can't argue what the barbarian in Diablo 3 can't do, because you have no basis for that argument.
So to be sure, you are ok with barbarians materializing hundred of pounds of matter above the ground? (Y/N)
Does the concept of classe archetypes ring any bells?
Am I actually arguing with actual people about this? This is surreal.
If you are arguing that the skill just doesn't feel "barbarian-ish" enough, then we can't really argue since that's an entirely subjective viewpoint. You could say the same thing for Ancient Spear since it's a ranged attack, or Call of the Ancients since a it's a summoning skill. IMO, the barbarian has a heavy, earthy feel to him, so it's not entirely out of the scope of his skillset. No, it doesn't make it any logical sense that the projectiles are materializing from nowhere. Half of the skills in this game, or more, don't make any logical sense.
We're not talking logical, b/c that's pointless. We're talking aesthetically, and I have to agree, Avalanche seems too much like a wizard spell. Spear and Weapon Throw, while "magical" still invoke a martial, melee weapon wielding aesthetic. It still "feels" barbaric. Summoning Ancients is borderline, but still, the Ancients do mostly melee damage, or throw martial weapons. Avalanche is different. It's pure elemental spellcasting. It's the perfect Druid spell (and yeah, Druids and Barbs are related, but there was that schism for a reason).