By biggest problems with Pipers are that
a) Channeling skills can be interrupted. Especially considering PP can only charm a limited amount of enemies this is really fustrating. Imagine Psychomancers Rise or Pyros Fire Pillar go away once the skill user get hit even for 1 damage, it’d render those skills almost useless.
b) The mice are not really practical. They remember all targets that were in aoe range when you cast the skill. Then they run to each target and bite it once. Once they have run to and bitten each target once they disappear. And sometimes they don’t rotate to their targets properly and their attack misses. Right now they are very very unreliable and extremely slow “aoe damage skill”. Imagine Elementalists Meteor, but instead of hitting all targets at once it, after hitting the ground, deals damage to one target per second, one at a time.
I too wish they’d behave like zombies, with small melee attacks that can hit several enemies if they are close to eachother, stay there, fight with you.
c) The mice can’t hit flying monsters. Instead, they’ll just disappear. Disappointing,especially since the skill icon shows a leaping mice, indicating that it can hit flying enemies.
I love this class because it’s so cute and relaxing, but right now they are very unreliable and not really up to par compared to other R8/R9 classes and not even R5+ classes when it comes to support, crowd control or damage.