It's a lot easier to pick out games where they actually played well and put a complete game together(offense, defense, special team, limited TO and penalties) since 2004 or so.
FL 2004, GA 2006, Cal 2007, SC 2009, SC 2013.
Those are the ones I can remember off the top of my head thinking the team played about as well as it could.
It's mostly been a series of missed opportunities(GA and FL this year), completely crapping the bed( AL since Saban showed up, Oregon), or "whew I am glad we got that one" for the last decade.