There is thus far nothing wrong in my world regarding Death Note, including the more recent attempts at beating a dead horse with a stick with the live-action "L-change the WorLd" and the BB murders novel. The only disappointing thing for me was the decision to not include L's successors in the live-action Death Note movies (though there is a vague nod to Near at the end of "L-change the WorLd"). Considering that the original manga is really an extremely convoluted mind-game of chess, where there are more thought bubbles than speech bubbles, it's amazing that they were able to pull off fantastically the first two live action movies albeit in a truncated form.
More amazing is that the anime version manages to keep the manga's mind games nearly whole. Unlike most people, I find the characters of L's successors, Mello, and especially Near, not to mention the background of all three young men being orphans raised in a home full of brilliant children for the express purpose of picking certain of them for duties such as L, aka the Whammy House, to be much more interesting. Particularly in the fact of their different approaches from L, their similarities and drive to beat each other to avenging L and to end the reign of Kira - all while Mello does so with a dark, passionate drive and seeming hatred of Near and his passive, painstaking method. In a way seeing how Mello and Near interact gives you more of a perspective of L's background than watching L himself for a majority of the series.
Basically, if you've made it this far through my review I'm surprised you haven't already hit the 'One-Click' buy button. This is the point of the anime where you go from the long, steady, plodding pace of Death Note to the beginning of the brawling, psychotic stampede to the end of the series.