Dawg fans say Smart can't beat Alabama. Basically they have had competitive games and lost late, and won rarely.
Any time you play another team roughly at your level it's a "50-50" game, and you have a 1 in 8 shot at losing (or winning) 3 in a row.
UGA used to lose to Florida regularly, some because Florida was really good, some when the teams were about even. Coaches of course get fired for losing too often to rivals.