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No, I'm not saying I wanted Malgus all the time. But like you said, the book was hyped as a book that focused on Malgus. He wasn't the focus, though. He was a secondary character that took a backseat to Aryn and Zeerid. I went into the novel fully expecting a focus similar to how Karpyshyn highlighted Darth Bane, and in that regard, I was left high and dry. The book did not accomplish what I had hoped it would. Still a great read, but definitely not one of the best.
Come on, Aryn wanting revenge? What EU story DOESN'T have a Jedi character like that? It's almost a cliche at this point, the amount of original character Jedi that have to straddle the line between light and dark. There was absolutely nothing new in Aryn's character arc, and I think that's what made her an awful character.
And what makes Darth Malgus an interesting character? I hear that so often: that Darth Malgus is somehow the most complex Sith Lord ever. Um, what? He's got the mentality of a grade school kid. He's got an attachment he knows he shouldn't have, and he has problems handling things with finesse like a Sith Lord should. Ok... and how does that add up to being complex? Because he can see himself being maneuvered out of favor? That happens to people in real life all the time, seeing the writing on the wall and being able to do nothing about it. There's absolutely nothing riveting there.
Plus, almost every single bit of the book is predictable. You know that when Zeerid gets the call to spice run his stuff to Coruscant, you know he'll hook up with Aryn before he gets there. You know that Malgus won't die. You know that Zeerid will get the prosthetic legs for his daughter. You know that Zeerid and Aryn will end up together. The only thing that caught me off-guard (though I suppose it shouldn't have) was Vrath's death - which I absolutely loved.
Look, the book is a great read. It's fast-paced, and tells a decent story. But to say that it's a better book than Revenge of the Sith, Labyrinth of Evil, The Unifying Force, Traitor, Shatterpoint, the Darth Bane stuff, Hard Contact, Rogue Squadron, Sacrifice, Vortex, Abyss... etc etc. You see what I'm saying? There's a lot of FANTASTIC reads in the EU already, and while Fatal Alliance and Deceived have proven that TOR has a great potential for fantastic stories... Deceived comes nowhere near the pedigree of established greats.