I switched this on just because there wasn't anything else on I wanted to watch - I used to love casualty, but sort of fell out of love with it years ago - but by heck I am hooked again!! Though like your nurse friend, SecretNutellaFix, I did think there were one or two tiny areas of the plot that lacked just a leetle bit of accuracy. Like opening up a department to major casualties when the equipment is still in the plastic and untested!
I did sort of think that it was more like a series finale than a new series, though - I can't imagine what disasters are left for them to suffer - earthquake perhaps, or alien invasion - there's not a lot else!
But this is on series link now, and I will be waiting with baited breath for next week! Oh, and I am glad that Charlie Fairhead's still there - he's the only character left from when I last watched it (which will tell you how long it is since I last watched).