What does watching the Yankees everyday have to do with anything? Tino Martinez as a Yankee was statistically a league average defender, (literally, his defensive value was +1 run) and a great hitter, (he was an average of +20 offensively). Giambi was a terrible defender, but an elite hitter as a Yankee (average of +35 offensively). Tino had an average WAR of just over 2.5, while Giambi had an average of 3.4. Giambi was not inept, in fact, he contributed more to his team than Tino did, statistically speaking.
The funny thing is, there is actually a metric to measure efficacy in high leverage situations, and Giambi ranked higher than Tino did during their respective times.
What I said has zero bearing on my thoughts about the Yankees. Giambi was better as a Yankee, that is a fact. I'm glad you don't want to argue, and neither do I, in fact, there is no argument, the numbers show Giambi to be better. You don't have to justify every comment, but when you make one that is factually incorrect, typically people will question it here. It's nothing personal, in fact I'm glad you've joined the discussion.