I watched the first two Death Note movies only because of the hype everybody was in. And after watching the first two movies, why not the thrid, too? I already knew, that it didn't really connect to the first two movies. That was another reason for me to actually give this part a chance. And I really liked the outcome!
L is just a great character and no psycho Light, Misa or Police interfering was very nice. I loved the kids and at some point hoped that L wouldn't have to die after 23 days. The main story about the virus reminded me pretty much of Bloody Monday, but not in a bad way. It only means, that there are many crazy people to try to "clean" the world with virus-weapons.
The reason why this movie only gets 4 stars is probably because there is something missing. Again. I felt like the story wasn't that new to me and even though I had times where I laughed and times where I felt touched, I didn't feel like it's a "masterpiece". It's only a nice story for all the L-Fangirls out there. Can be watched without knowing the first two movies. So 4 stars for this one.