Planet Terror: 6 out of 10.
It only took me three weeks to finish Grindhouse. A bigger fan of Quentin Tarantino than Robert Rodriquez, I opted to watch Death Proof first.
I far preferred Death Proof, which I gave 8 out of 10, but I didn't hate Planet Terror. It was harmless campy fun that reminded me of the days I'd rent Troma films like The Toxic Avenger.
If you only watch one Grindhouse film this year, make it Death Proof, but if you have the time, watching both won't kill ya.