It won't be Tru stopping people from dying every episode. She'll try, however Eliza and producer Jon Feldman have both emphasized that she won't be saving everyone. Some people can't be saved or there's judgement calls. For example, if she saves one person, perhaps someone else dies. Eliza's also mentioned the idea of playing God- so maybe if the person she's saving deserves to die, what then? There's plenty of moral dilemas they could set up that could keep the show interesting.
I do see it as being kind of borrowing from a lot of shows and depending on what you've seen before, you might see it as predictable. Early Edition has dealt with all of the same ideas of preventing deaths and all of the crime dramas like CSI and Law & Order have the same kind of investigations and miss-leads. From what I've read of the first 2 episodes, they play out like a lot of CSI and Law & Order episodes. Those are popular shows, so maybe that's okay.
Trancentral hit the nail on the head with one of TC's problems and it's going to take really gifted writers make the show original when you have the same events repeating over again in the same episode. And how many episodes can they keep that going for without viewers getting bored of the patterns set up?