The traitor arc is really good, you're probably heading for a heartbreaking crucial decision by the way. I won't spoil it, but I made the decision one way with one of my characters and it was crushing.
You also at the start of onslaught can make the choice to be a saboteur against the side your aligned with or not. I will tell you that it creates a whole different storyline.
On the first traitor flashpoint where your on the Chiss world there's a hidden boss enemy on near the final enemy when your in the tunnels. so explore a bit, he's a little tricky to kill but it usually drops a pretty good reward.
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My name is Ozymandias, King of Kings;
Look on my Works, ye Mighty, and despair!
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