The main bar graphs that the default RPT reports shows, does not include script aborts which may occur during execution.
The 'exit on error' that can be set at the schedule, or script level, are not showed in the report. This will make RPT display 100% success during test run, even if there are issues with respect to the script aborts with respect to the test run.
The result is that each and every request can be failing, but the bar graphs show 100% success.
An RFE ID 42720 has been raised for the same.