I was kinda, sorta following the Resurrection of Ra A'Ghul story, through the magic of online reviews, and I was left a bit disappointed that Robin didn't follow through with what looked like a potential heel turn.
It seemed like the pieces were there. Tim has always been at least somewhat calculating, and it only seems to have intensified in the last few years. He's lost a ridiculous number of people close to him in the span of what, two years (their time, not our time). Bats, Alfred and Nightwing may be trying their hardest to help him through it, but they can't replace all the people he's lost. And Tim's already wasted a bunch of time trying to clone his best friend, so I was surprised that he wouldn't at least keep those samples he had briefly taken from the Lazarus Pit, even if he isn't going to actually join Ra. I mean, Tim tried cloning, even though that wasn't likely to recreate Superboy's soul, but he's going to give up on this possible answer because Nightwing talked to him?
Teen Titans has been telling us that it's apparently inevitable that Tim will get his "control the world" freak on at some point in the future, even though he keeps meeting his future self and acting as if he's disgusted by him. So why wait? Start now! Heck maybe if he uses the Pit to bring his friends back now, it'll stave off his metamorphosis into what he's been shown to become. Or maybe successfully using the Pit's chemicals would convince him that he was right to try this, and accelerate his change.