At the moment we cannot extract directly the results from a test execution to Excel Sheet. The LastResult variable is a bit tricky and will give only the last Checkpoint outcome and not the test out...
fyi Last Operation Result is meant for operations and not tests
http://support.smartbear.com/viewarticle/57013/
You can parse the log data into a custom report like this:
http://support.smartbear.com/viewarticle/55140/
If you're just asking for a feature, requests go here:
http://community.smartbear.com/t5/TestComplete-Feature-Requests/idb-p/TestXCompleteFeatureRequests