a5 merc is disgusting crap- they attack once per 3 seconds, so its just impossible to sustain any mediocore pack of mobs. just stick with a2 and be happy.
gold system is crappy indeed, on top of that its executed very poorly. Considering how bad drop rates are, there is no reason to kill monsters at this point (from a1 nightmare). just make 2 hours of amazing chest running in blood moor and rush trought the act mindlessly...
worst thing is that AM has something that keeps you playing, I feel like starting over again every day, but I remind myself how terrible it actually is (crashes, chest running, drop rates) and it helps me staying away
