I like hammer's CC powers but there's almost never a reason to use it for long before switching to something else, unless you just like it as a concept. I think a simple improvement to the AA would help. perhaps a stun on second chain, or apply confusion, anything that makes some amount of sense really. perhaps just more damage in general. Even with the symbol at the end, I feel hammer just under performs if you want to stay on it. Also a couple of the CC abilities could use a tweak or two but that's another topic.