I dont think its a real problem with powers as a such but i personally think we have a problem with enhancements.
I think we should have a cap on the amount of same enhancements we can have on one power. Say a max of 3 damage enhancements on a attack power.
Its the way we are maxing out our powers rather than the powers themselves that are leading to nerfs.
Throw in a max enhancement cap in issue 3 as well imo.