Well, return of capital (ROC) is just that, the giving back of your money and in IGR's case, wrapping it up in the dividend. It inflates the monthly distribution and gives a false perception of the actual yield from the performance of the underlying assets.
ING Clarion should be embarrassed to report IGR has a yield of 8.8% when 19% of the dividend is ROC. I, too hope to see this number go lower and lower. Also, I would have rather seen IGR simply cut its dividend to the point there was no ROC added into the monthly distribution. It would have been much more representative of the times.