The hammer itself annoys me only because I now have to carry two hammers – repair and construction – where before I didn’t need any. I wish they would either merge repair and construction hammers, or give me back the action binding for checking ownership and decay of buildings.
As for the build system, I’m now completely used to it, yet I still hate the fact that I can’t switch between a small subset of pieces without involving my mouse. I just hope Funcom will toss the people like me a bone and implement a construction hotbar.