Zookster, I believe he is talking about R&C, it happened to me too, died half way thru and had to restart from the beginning, the thing was minorthr, is that you didn't get to the checkpoint, that is why you had to go back.
After past that level, there are short checkpoints, so you don't have to go back too far.
Overall I love this game, I am getting it soon, its fun and addictive, and since I beat Uncharted drake 2x. The only game in my library that I don't have enough to beat is Assassins Creed, that game is soo long.
I am also in the process of beating CoD4. I am also investing some time on RFoM Multiplayer, and Warhawk (I am teh suxor in this game).
BTW, any of you guys going to be on PSN tonight?
I will be playing CoD4, Warhawk, and probably few other multiplayer games.
Hit me up, I am IcEWoLF on the PSN.