Great show, just finished it. Not all action, all the time, very much like your British shows such as Lewis and Morse, but with a violent twist and a family situation. It rarely went down the predictable path.
I thought her accent was fine. It was just enough "carnival" without being distracting. I'm a Brit and had no problem with all the others. The older daughter (gosh I am terrible with names) was also in Misfits this season and has a terrible scowl / po-face