My group is going through RotRL an have just started the hillbilly madness in book 3 .. The party comprises Druid,fighter with a dip of bard , wizard with a dip of fighter ... There has been 1 PC death and one near PC death that the use of hero point from another PC saved ( so yeah use hero points if your finding it hard going they help a lot) my players are experienced and they have just torn through this adventure with out to many dramas (they do have the 4d6 build and are above a 20 point buy ) I do not think RotRL is a meat grinder. Thou we have all been enjoying it greatly it's a very well written adventure