most players that get to play one out of every 5 to 10 games tend to be inconstistant. that holds true in any sport.
True enough, but there are certain positions where the mental aspect is so key and the guys that learn to stay mentally sharp do well in that roll. A closer in baseball may not get in a game for 5 straight games, but has to come in on moments notice and be sharp. That's similar to a back-up goalie IMO. Unless there is a major injury, he HAS to be mentally sharp on a moments notice or he will fail.
Peters wasn't just inconsistent when in strictly a traditional back-up role, he was downright terrible. But as BD said, when given a string of starts in row, he was more than serviceable. If he can figure out how to stay mentally sharp in strictly a traditional back-up role, he'll be a good back-up for you guys. He's probably grown/matured as a player in the past couple of years also.
Of course, it didn't help that the Canes have traditionally had a dumpster fire for a defense. They weren't a good enough team to overcome sub-par goaltending.