People complain that by using midichlorians, it ruins the mysticism of how people are determined to have the Force. Now, it's knocked down to nothing more than a blood test to determine if you have the Force or not instead of Jedi having "a feeling" about a certain person. Honestly, I agree with the argument. It would be like saying Jesus was the Christ not because of faith but because he has the right number of chromosomal alleles to be the Christ. Takes the faith factor right out of the equation.