Jon Weisman seems to think so in his latest piece at Sports Illustrated:
Perhaps the playoff contender that could feel best about its starting pitching is the one with the worst overall record: the Cubs. All five Cubs starters last week had an ERA+ over 100, and all but one (Sean Marshall) had made 24 starts or more. For a team that still mourns the disappearance of Kerry Wood and Mark Prior from the starting rotation, that's pretty impressive -- and could be the key to Chicago holding off St. Louis.
For the first time since 2003, the Cubs have a pretty solidly healthy rotation. A lot of that has to do with not planning for health out of either of Mark Prior or Kerry Wood, which was really setting up the team for failure. I'm not a big Hendry fan, but this seems to be the year that, finally, belatedly, he got it about the starting rotation.