I would say Manny is one of the most clutch hitter of all time, but if you look closely at Arod's stats, he has done his job. In his career, Arod is hitting .304 with RISP, 115HR, .554 slug, and .398 OBP. Not to shabby. For HR, Arod has hit 7 walk-offs, 165 Go-ahead, and 41 gametying. In 71 more games, Manny has hit 3 walk-offs, 145 go-ahead, and 43 game tying. Arod sounds pretty damned good, huh.
Sample size guys. Sample size. Don't judge a player on a handful of games he has played, judge him on his career. Through Arod's career, he has been one of the best players in the game, a great situational hitter, and has done pretty good overall in the playoffs. Thats the facts. Also, there is a great article on the truth behind "clutch". Read:
http://sports.espn.go.com/espn/page2/story?page=betweenthenumbers/ortiz/060405