Structure of command created for PowerShell build step

I'm new to TeamCity so forgive me if I'm missing something.  We use psake, a powershell build tool similar in function to NAnt, I've noticed that even when my PowerShell script fails the TeamCity build succeeds.  I think this could be because the command TeamCity creates to run my powershell script uses this at the end: && exit /B %ERRORLEVEL%.  The && tells the windows command interpreter to run the next statement when the previous statement doesn't raise an error.  It seems to me that "& exit /B %ERRORLEVEL%" is what's actually wanted here.  This will ensure that the "exit" command always runs setting the exit code to the ERRORLEVEL set by the powershell script.  

Is this valid analysis or am I doing something wrong?