Thanks. I will look at that in more detail later on.
Baseball is a relatively simple game. Its runs scored/runs prevented. I think you can get bogged down too much in overanalyzing the game with countless ways to look at data. In the end, a good pitcher is one who prevents the other guys from scoring runs, be it in Boston or in Tampa Bay or anywhere else, so I think that the single (but not the only) best indicator of that is ERA. If others want to use ERA+ to support their positions, thats fine. And for hitting its OPS because I want a guy who can hit for both average and power on my team.
There are lots and lots of statistics, and which ones you feel best give you a true picture is a matter of personal preference. I would rather not have to dig up 20 different ways to look at performance; a couple of data points are sufficient for me to form an opinion, and until hard proof is presented that a different approach is better, I'll stick with what I believe. Others are free to do the same.