Tiger has actually played well in team competitions back to the 2009 Presidents Cup. Undefeated there, 3-1 in the 2010 Ryder Cup, and went 2-2 last year despite poor play from Stricker and Johnson. I believe there was a stat that said Johnson missed 16 putts inside 10 feet when he and Tiger played 2 matches as a team last year.
So, in his matches he's 9-3 in the last 3 team events he's played in. That's a good trend for this Ryder Cup, coupled with the fact that he's had tremendous success at Medinah.