I've heard that a lot of people complain that the story for the Jedi Consular is really boring, and I completely disagree. Let me explain... (Warning: Spoilers below!)
Bioware themselves have said that the Consular is based on Obi-Wan Kanobi, while the Knight is based on Luke Skywalker. So, first off I will admit that Consular story does start off kind of slow, however, by the start of Chapter 2, the Consular character really finds his feet and he really becomes...well, in terms of personality & abilities you very much become like Master Satele Shan in many ways, you know? You're still a relatively young Jedi, but throughout the prologue even, its heavily implied that there's a stud in there, a rock inside that alien who's exceptionally strong in the Force, that could be a better Jedi leader than Master Yuon was, a better Jedi leader than the Order has seen in a long time.
You start off like all jedi, you know, as a padawan. Then you go about saving these afflicted Jedi Masters, and you've got this Jedi Council's pet healer/wise man kind of personality, and by design, you know? You can't just start the character off perfect, there's nowhere to go from there.
And up until the end of Chapter 1 your character prefers words to action, much by design. But in Chapter 2 it's time for him to step it up, because the Republic is in danger, and the Empire plans to hit them while they're vulnerable. As thanks for all the Jedi you saved and defeating this plaguemaster, you end up becoming a Jedi Master & Barsenthor,the latter of which is a title of extreme respect given to a trusted diplomat and warden of the order. Your job in Chapter 2 is to convince a number of planets that the Republic cares about them by fighting the Imperial presence on each world - because if those worlds do secede there's no way the Republic will be able to survive the Sith Empire's assault. And then in Chapter 3, when the peace treaty is shattered by the Empire, is where you find that next gear and really become this Jedi Master that all of the Rift Alliance worlds & the races you recruit unequivocally tell, "Yes, we will follow you to the seat of the Empire and beyond." The final boss of the Consular story I won't spoil for you, but suffice it to say that it really played out in a way I did not expect. And at the end of the story, you end up becoming part of the Jedi Council (though you still go off and fight the Empire on Illum). How awesome is that?!
As for the Jedi Knight, correct me if I'm wrong (I haven't actually played one), but from what I've seen a lot of it is predictable lightsaber duel after predictable lightsaber duel. Even though it does culminate with you killing the Emperor (which is undeniably EPIC), according to the lore behind the scenes, not only does he ultimately actually survive, but instead of removing the evil influence and allowing the Empire to accept a new path of life as the Knight had intended, they're now more determined than ever to destroy the Republic and the Jedi.
Having said that, I think the main reason why so many people prefer the Jedi Knight's storyline is because it involves a lot more action, remembering what the Jedi are supposed to be about. This lawful good overdrive. We're supposed to be superheroes, you know? Even if we are defenders of peace, we can't just sit around while the Empire kills innocents, murders Jedi, and enslaves force-sensitives. And I think a lot of players want to feel that overdrive -- we're in it to make the galaxy a better place. And I think also the Trooper storyline has its own version of that, you know, stopping to consider what's happened the past couple of years and what's been lost and fighting for the good of the Republic and all. Plus I know a lot of people really like classic warrior classes in MMOs (I myself have always kind of liked healer classes and I would definitely point out that the Consular, especially the Sage, is not really intended to be a "warrior" or "fighter" lore-wise)
But I definitely think the Consular's story is very well-written in it's own way. You'll be proud to be a Jedi by the end of this thing, regardless of which class you choose.
(On an unrelated note: I've always thought the male Consular voice sounds a lot like Alex Trebek.)
Anyone else who has played both a JK & JC agree?