I viewed Death Note in this order:
movies, manga, anime (not done yet)
I rate the movies about 7/10, not the best but it was very enjoyable!
Watched the 1st one by myself, thought it was pretty good. When the 2nd one came out, I watched it with my friends (both movies). These guys don't usually watch jap movies but they enjoyed it. Even though the ending pissed them off (I think it pisses off everyone), We watched it back-to-back, so we were pretty burnt out in the end.
This is kind of a spoiler, but some stuff are different from the anime.
You'll find Misa-misa either hella cute or obnoxious.
Casting was pretty good, L was great. Light did a good job, but they could've found someone better, I reckon.
Also, there's a some swiming lessons in the end