When the function "passed" is called from some init script (like after doing fsck in rc.sysinit), it will be displayed as "[PASSED]" (which is OK), but it will be logged via syslog as "succeeded", because both "success" and "passed" use the "-e 1" option of initlog. This can be rather confusing, so maybe initlog should get another -e option, which is logged as "partial failure" or so.
Maybe; it's currently logged as succeeded because it is a successful fsck, even if it was forced to check (sometimes it's forced to check because of the mount count, etc.) Of course, if it's completely unsuccessful, you're dropped to a shell, so it doesn't get logged anyways. ;) We'll think about this for a future release.