I'm filing this here as it only affects Maven 3, and I'm not sure which solution is preferable, but expect this to be moved to SUREFIRE.
In a multi-module project, especially with a large number of modules, the reactor summary will scroll the surefire results out of the window. See also: http://java.dzone.com/articles/upgrading-maven-3
One option is to repeat just the "Failed tests" part in the exception. This would require a change in Surefire. I similarly just added this advice to https://cwiki.apache.org/confluence/display/MAVEN/Maven+3.x+Compatibility+Notes#Maven3.xCompatibilityNotes-ErrorReporting
However, if others think it might be better to adjust the output (eg, by only showing failed reactor modules, or making the summary optional) that's another possibility. I think given parallel builds and fail-at-end reactor options it's best to pursue the former, though.