My whole point is this:
A bad defensive catcher will give away as many runs, if not more, with his poor fielding. The catcher is the most important defensive position in the game.
As a Yankee fan, we have suffered with Posada behind the plate. The ignorant among us believe Posada has a great bat, giving offense out of a position that normally does not, without realizing that they often will cost a team more runs than they create.
Red Sox fans this season will see this in the 2010 season. The only question is whether Martinez will give up more than he creates.
Sadly, there is no great metric for catcher defense. UZR, quite possibly the most flawed statistical metric ever quoted here, got it right for once. They simply don't have a metric for catchers. This means that people here have to, inconceivably, actually watch the game and determine for themselves how good a player is. They aren't spoon-fed information to make them feel smart.
However, this is not that difficult. By far, the easiest defensive position to determine on television is catcher. That's because the camera is on the catcher nearly all of the time. So watch how the catcher sets up. Watch how they frame a pitch, and then watch the opposing catcher. You'll start to see how much an effect the catcher has on a game.
For all of you that have MLB Network, watch the highlights where they break down CJ Wilson. Wilson threw 4 strikes to Nick Johnson, and each one was called a ball. Get past Mitch Williams commentary, and you will see what I mean. Their catcher was terrible. He lost a third strike call on Granderson, and the next pitch resulted in an error in which two runs scored.
Some people here will refuse to believe in something that can't be quantified, however incorrectly. I don't watch Martinez anywhere near as much as you do, or will. So chime in here, AFTER you've watched how good/bad he is behind the plate, and throw in your two cents.
The final thing I'll say about Martinez is this...if he is anywhere close to how bad Posada is, you'll be lucky to be in the playoff hunt this year. Your team simply doesn't have the offense to make up for it.