What was Jennifer Garner's best role?

Alias by far

Juno, but that wasn't a role.

They just followed her around with a camera for a day and told Ellen/Jason to jump in and say a few things.

Alias!

Alias!

Double Post.

Garner is 100% convincing as the "Inbred Country Bumpkin" in the yet to be released documentary, Bastard Out of W. Va, but then again, it is basically a self-portrayal so it isn't exactly taxing on Garner's limited "acting" abilities.

Best role? As the long-suffering wife to a cheating man who has to be taken on pap-strolls to make him look like a family man.

Oh, wait...you mean best FICTIONAL role don't you?