Having just completed all the class stories I must rank the stories as such
Grade A
-Imp Agent (great story from beginning to end, with nice plot twists, keep my interested till the end)
Grade B
-Sith warrior (great story from beginning to end, messing with the jedi=fun, missing just a little interest at times)
-Sith iinquisitor (story dragged a little in middle, great ending, was able to keep a person interested)
-Jedi Knight (story dragged a little at times, best ending of any story, choices matter)
Grade B-
-Bounty Hunter (story was good, most companion additions has fun stories i.e. Gault,)
-Smuggler (story was good, dragged a little chapter 1, made you feel like a shifty smuggler=good)
-Trooper (always felt like you were progressing republic interests, ending was not great)
Grade C
Jedi consular (barely passible, story dragged from beginning to end, worst ending of all stories, lost interest in story line many times to switch and play different characters)