Death Note (2015).
It was actually better than I expected. I have a low expectation of many TV adaptations of either anime or comic book, since they tend to have a lower budget, but this one actually has decent writing and some praiseworthy performances (particularly Masataka Kubota as Light). I didn't like Kento Yamazaki as L though. He's a good actor, but I feel that the writing is off; making L this haughty and arrogant bishounen is just boring and wrong. L is supposed to be stoic and emotionless.
Aside from the casting, however, I enjoyed the little changes they made to the story to keep things refreshing for long time Death Note fans.