I can see your point, that's how I kind of felt for whichever episode it was with Twilight obsessing over sending the letter. I think they may have just wanted her to have her own "psycho" episode, and while it was entertaining it did feel a little exaggerated and forced. Though now they don't have to end every episode with one of those morals if they don't want to I suppose, so that could have been an ulterior motive. Anyway, I can't say I felt the same way about the Nightmare Night episode. Didn't feel nearly as exaggerated (to me anyway), but again I see your point in a couple of other parts of season 2 in terms of over-exaggeration. Still, I've been enjoying it a ton so far and I'm not too worried that trend will cease.
Like Shredder emerging from the ooze, I've returned for a while!