Well i believe i am on the last boss... Think i have played for about 19 hours but done a load of the rumors etc and honestly, the campaign does seem a little short (Unless there is a big chunk of it after where i currently am) I love the main planet being so huuuuuuuge, its actually pretty impressive how big it is and the different areas are fantastic but its not really the same in the other areas. The desert bit is pretty meh, the shattered moon is very simliar (And in one place near the big boss fight you can actually get stuck and cant work your way back out and cant fast travel either) and Coruscant is pretty much on rails and quite small in scale.
I have enjoyed it and hope there are some nice hidden areas to get to with some good boss fights (Although the cavern area is a bloody nightmare..
) but wanted a bigger epic length game but i have been doing other things and have almost completed the main game in less than 20 hours. I also think the main villains come across as one dimensional without a great deal of substance.
Will see if there is the 51 hours that they have touted as full completion in the actual game.
After looking at the index of the walkthrough it does look like i have a few more episodes to go...
I did see a spoiler about a certain skill available towards the end of the game but i havnt got it yet so that really should have tipped me off DOH!