How do I get the error level of commands in a pipe in Windows batch programming?

I had a similar problem and settled on the following solution as I did not need to detect the exact error code just success or failure.

echo > .failed.tmp    

( foo.exe && del .failed.tmp ) | tee foo.log

if exist .failed.tmp (
    del .failed.tmp
    exit /b 1
) else (
    exit /b 0
)