I care about being confident that the data supports the conclusion. I want all the data in the open and open to scrutiny. Whether the Earth is cooling, heating, staying the same - I just want it proven with open source code, not on a consensus of people I don't know using data hidden from the public, with code that I haven't read.
Edit: I am sure the vast majority of scientists are true to the data. And this project will only help reinforce their work.