Isn't brtfs itself just a ZFS-inspired filesystem? If that can manage to find a foothold, why can't this?
building fs with such large features set is just untrivial task, and btrfs one of very few who made it, so it is absolute success story.
In what sense?
The reason I ask is because I'm trying to tease out if you have architectural problems with the way the filesystem is designed, or if you simply think it's unreliable.