Dusty Baker. Let's put it this way: When Baker put in Remlinger in the 8th when the Braves took the lead I said to my dad, "Uh oh, Dusty Baker is making a pitching change. He must be wrong." First batter JD Drew hits a 2 run double and goes on to score, 8-6 Braves.
Lack of a closer- Borowski sucks and Hawkins can't save a game for his life.
Lack of consistent hitting- They have a lot of power guys like the White Sox, but nobody on base to keep a consistent lineup. As us White Sox fans have found out the hard way, power hitters go through hot and cold slumps. The Cubs' offense hit a cold slump at the end of the season.
Obviously, I would be foolish not to mention the early injuries in the season. However, the same can be said for the Astros.