I think you will find they have won 7 of 9 and the only good teams they beat were Freo and Eagles in Adelaide and lost to Brisbane.
Their draw lies about their true form but I do agree they should beat the Swans as I don't think the Swans can kick enough goals unless their midfield kick a heap and Goodes decides to actually play.
Sorry mate, I meant 8 of the last 9 against the Swans.
Round 6, 5 May 2012 SCG
Sydney defeated by Adelaide 94-99
Round 15, 2 Jul 2011 AAMI Stadium
Adelaide defeats Sydney 57-50
Round 2, 4 Apr 2010 AAMI Stadium
Adelaide defeated by Sydney 75-118
Round 13, 27 Jun 2009 AAMI Stadium
Adelaide defeats Sydney 85-69
Round 17, 26 Jul 2008 SCG
Sydney defeated by Adelaide 53-77
Round 4, 21 Apr 2007 AAMI Stadium
Adelaide defeats Sydney 61-44
Round 14, 9 Jul 2006 SCG
Sydney defeated by Adelaide 62-101
Round 18, 30 Jul 2005 AAMI Stadium
Adelaide defeats Sydney 54-47
Round 4, 17 Apr 2005 SCG
Sydney defeated by Adelaide 79-120