1h animations are pretty awesome.
1h and polearm are in the same boat. They each get one awesome animation (left swing for 1h, right swing for pole), but every other attack direction has a major malus that offsets the benefits of that attack direction. For instance for 1h:
Left Swing: Fast, hits head, and won't glance, but no reach bonus.
Right swing: Reach bonus, but huge delay and will glance during the first ~40% of the animation
Thrust: Reach bonus, but will glance during the first
and last 20% of the animation. Wonky hitbox way off to the right of the actual animation.
Overhead: Nothing special (good or bad)
Compare that to 2h:
Left swing: Reach bonus, won't glance
Right swing: Reach bonus, won't glance
Thrust: Massive reach bonus, but glances during first ~10% of animation (feel free to correct this one, I'm not sure of the 2h thrust "sweet spot")
Overhead: Reach bonus
So maybe subjectively some people will say "1h animations are good", but objectively, they just have more drawbacks than 2h animations do.