Strategically, Bobby was a dumb ass. He overworked relievers, relied on the wrong ones, played Keith Lockhart, etc. One thing he did that I particularly hated was treating the season like a match play golf event, meaning that if the team won the first two games of a series it would be Chipper and seven bench warmers in the finale regardless of where the team stood in the standings. But as other have said, that's merely a small part of the equation. Bobby was genius-level in managing people, to the point where it far outweighed his in-game shortcomings.
Regarding Snitker, the only way he has even a slim chance of being fired is if the team goes on a 2011-like collapse at the end of the season to miss the playoffs. Even then I think he'd get next year to try to improve.