Let's be fair here.
ARod has been bad in the clutch as a Yankee, for all but one year (2009).
What you have to understand, is for a team like the Yankees, "clutch" is defined different than for almost any other team (maybe the Phillies have reached a similar level, but personally I don't think so). ARod can hit over .300 in the playoffs, but if he K's in a key spot with a game on the line, or goes 0-4 in a Game 7, that's a failure and it doesn't really matter that he went 3-4 in Game 2 in a game that the Yankees won 8-1. The standard is different in NY. They make the playoffs every year. HR's in April mean a little less, and big playoff spots over ride all else.
Take a look at his OPS in each playoff series as a Yankee. Out of 11 series, he was below his career OPS in 7 of them. The last two years, he's 9-50 in the playoffs. Last year, Arod, Texiera, and Swisher all disappeared against Detroit. In 2006, Arod went 1-15 in the ALDS against the Tigers. He's been bad far more often than he's been good.
Overall, the Arod hate among Yankees fans is stupid considering he's won two MVP's for the team and up until maybe this past season he's been there best player since the day he got there. Obviously it has a lot to do with Jeter, which is also stupid, but again, to be fair, Arod talked all that shit about The Captain when he first got to NY, and you just don't do that.
Yankees fans are geeks for hating on Arod, but I can't kill them for hating on his postseason failures. He's had tons of them, and has had some BRUTAL playoff series.