The gray points are raw data from CRU.
The Red line is the GISS anomaly data.
The orange dots are simply the arithmetic mean for each month of the data recorded.
The Black dots on the bottom represent the total number observations in the data set (multiply the chart reading by 20).
I am definitely not qualified in the eyes of "real" scientists to make assessments of what the raw data says. Looking at averages is a useful technique. Ignoring the raw data altogether though can cause you to forget about magnitudes. The GISS Anomaly temperatures seem consistent with the feel of the raw data and the simple mean. The magnitude of the changes in the GISS Anomaly seems insignificant when presented with background of the Raw Data.
(Once again, clicking on the image will take you to the full size image which is rather large. The total number of points in the data set is approx 4.8M. I attempt to show the number of times a temperature appeared in the dataset with the darkness of the point representing it. )