Well I got through the core campaign with Roland. On Easy mode I might add (I'm looking to progress fairly quickly to get up to date for the new releases!) Really fun, very enjoyable. Had to amp up his ability to take horror, and maximise his damage output and that seemed to work.
Onto Dunwich next. I am keen to hear of any investigators you found fun to play through this campaign (including the 6 Mythos Packs). So many choices!
Not necessarily the optimum choice, but any you found playable and fun (or conversely and that aren't so fun) would help inform the decision.
Poor Roland is gibbering in a corner - he needs a long holiday ;-)