Experts still needed. There are good reasons to be suspicious of metric-based research assessment. (Editorial) Nature 2009 (457):7-8
There are different kinds of metrics for research, but they do not always prove to give robust results. This is the case of the Research Assessment Evalutaion in UK, as described in this editorial. Expert review is far from a problem-free method of assessment, but policy-makers must recognize its indispensable and central role.