How is Ortiz not better than Martinez? Leaving aside Ted's point about the relative impact on their franchises, he leads Martinez in nearly every major statistical category. Hits, runs, RBI, doubles, triples!, home runs, slugging, and total bases. His batting average and OBP are lower, but he played two more seasons than Martinez, and his OPS is only a couple points behind. He will most likely overtake Martinez in walks by the end of this season. Ortiz finished in the Top 5 of MVP voting five times, including four consecutively, Martinez finished in the Top 5 once. Ortiz also led the league in RBI twice to Martinez's once, and Ortiz did it at a time when he had much more competition for the honor. About the only statistic that Martinez has a decisive advantage in is stolen bases. Ortiz was a very important and very productive part of three World Series Championships, and he is respected and feared by every pitcher and team in baseball at a level that most guys can only dream of.
Martinez should be in the Hall of Fame, I would never deny that, but I really cannot see any way in which you can make an argument that he is better than Ortiz. I can barely see an argument for saying that he's equal.