BTV CTLR IS FRUSTRATED WITH PLT COMPETENCE DURING VECTORS TO ILS APCH.

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I AM A CTLR WITH 22+ YRS FAA EXPERIENCE PLUS 4 MIL. I HAVE NEVER SEEN SUCH INEPTITUDE ON THE PART OF A PLT AS MR X; PIC OF ACFT X. TODAY HE FAILED TO HOLD ANY COURSE; MAKING NUMEROUS UNPREDICTABLE TURNS AND COURSE DEVS WHILE ENRTE TO THE ILS RWY 15 APCH. THE CTLR ON DUTY HAD TO ISSUE NO GYRO VECTORS; WHICH ALSO FAILED TO KEEP ACFT ON A STEADY HDG. THE PLT GOT TO THE LOC; THEN ZIGZAGGED DOWN AN APCH MONITORED ILS. HE REQUIRED MORE VECTORS IN EMER/FLT ASSISTANT CTLR POSTURE. THERE HAVE BEEN NUMEROUS DEVS AND ATC COMPLAINTS ABOUT THIS PLT. HE WILL KILL HIMSELF AND POSSIBLY OTHERS. HE HAS LOST HIS TICKET IN THE PAST; BUT FSDO RECERTIFIED HIM. THE CTLR FORCE AT BTV CANNOT UNDERSTAND HOW THIS GUY CAN BE ALLOWED TO FLY IN ANY CTLED AIRSPACE ENVIRONMENT. HE ALWAYS REQUIRES AT LEAST 1 CTLR'S FULL ATTN WHILE SVC TO OTHERS IS DISRUPTED. THIS IS A FSDO FAILURE TO UPHOLD ANY REASONABLE STANDARD. SUPPLEMENTAL INFO FROM ACN 594853: THIS PLT COULD NOT HOLD HDGS OR FLY THE ILS APCH. PROBABLY MOST DANGEROUS PLT I'VE EVER SEEN.