Thank you for the replies guys, I really appriciate the feedback.
I will probably be playing on Normal although I have tried bouncing back and forth between that and Hard just to see the difference between the two levels and further test my party setup. In all honesty I will probably run it on Normal, in part becuase its my first run and mostly because of my job and kids Im lucky if I get a ferw hours every other night to game. So with limited time id rather play knowing I wont be stuck on one area/mob/boss fight for hours on end.
I have been noticing this exact issue where both my tanks PC Paladin and Eder are ignored in favour of my ranger and esspecially my rogue. Once I engage him with his dual wields with the sneak attack and reckless assult bonuses he seems to be a priority target. I had assumed that perhaps it was his high damnage making him the main target but from reading above perhaps its more that his defence is so low.
After googling Tidfall I was surprised to see it was a 2H. I guess my main instinct with Rogue was to go a very traditional dual wield build. I never gave much considaration to him having that class of weapon. Ill need to look into it and possibly respec / restart as that could be a very interesting build.
I was giving some more thought to the Ranger and I was wonder if you guys thought it might be more benficial to have a second rogue fill this roll instead as a dedicated range DPS character. My thining was that both would benefit from the sneak attack procs caused by each others abilities?
Once again thank you both for the responses. Its given me a bit to think about. I can se me restarting this game for a 3rd time now lol. At this rate ill be lucky to finish Act 2 let alone the game!