SMA VFR NOT ON A FLT PLAN WAS VECTORED IN ARSA TOWARDS TERRAIN AND WX. THINKS ATC AT THIS FAC POOR.

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I CAME DOWN THE COLUMBIA GORGE VFR. GOT ATIS E AND CALLED PDX APCH FOR LNDG JUST N OF THE E END OF REED ISLAND. I WAS GIVEN A SQUAWK AND A VECTOR TO A VFR DOWNWIND. TOLD TO MAINTAIN 2500' AND GIVEN THE WINDS AND MY CHOICE OF LNDG RWYS. I CALLED THE ARPT IN SIGHT OVER CAMAS. I WAS GIVEN FREQ 126.9. IT TOOK ME A WHILE TO CALL ON BECAUSE OF A LOT OF RADIO TFC. AT THIS TIME IT APPEARED THAT THE WX WAS RAPIDLY DETERIORATING TO ABOUT 3000 AND 3 MI IN HEAVY RAIN. I WAS GIVEN A TURN TO THE NE FOR SEQUENCE. I QUESTIONED THE CALL AND ASKED HOW LONG I WOULD HAVE TO STAY ON THIS HDG BECAUSE OF HEAVY RAIN SHOWERS AND THE PROX TO HIGHER TERRAIN TO THE NE OF PDX. I TOLD THE CTLR I COULD NO LONGER STAY ON THE ASSIGNED HDG DUE TO WX AND TERRAIN. AFTER SOME DELAY I WAS ASSIGNED ANOTHER HDG WHICH STILL DID NOT SOLVE THE WX PROB. ANOTHER LIGHT ACFT JUST BEHIND ME WAS HAVING THE SAME PROBS. THE CTLR KEPT TRYING TO HAVE ME FOLLOW AN AIRPLANE TO THE ARPT THAT I DIDN'T SEE TO AN ARPT I COULDN'T SEE. ONCE I GOT THE ARPT IN SIGHT I WAS SWITCHED TO TWR; WHO I HAD TO CALL 3 TIMES TO CONFIRM LNDG CLRNC. ON TURN OFF I SUGGESTED THAT THE ATIS BE UPDATED. I GOT THE SMART COMMENT BACK THAT THIS WAS 'THE WX WE GET FROM THE WX BUREAU AND EVEN THOUGH IT MAY NOT BE ACCURATE; THAT IS WHAT WE HAVE TO USE.' ON DEP I WAS GIVEN CLRNC TO TKOF ON RWY 10L EVEN THOUGH THE ACTIVE WAS RWY 28R. I CONSIDERED BOTH APCH CTL AND TWR SVCS MARGINAL WITH A LOT OF EXCESS RADIO XMISSIONS DUE TO MISUNDERSTANDINGS AND MISTAKES. THE SITUATION WAS HURT GREATLY BY INACCURATE WX. THE APCH CTLR THOUGHT THE WX WAS 5000/30. WITH THE WX AT 3000/3 IN HEAVY RAIN THE CTLRS ABILITY TO RUN VISUAL APCHES IS GREATLY DIMINISHED. AS A PLT WHO PREVIOUSLY FLEW FOR A RESERVE UNIT ON PDX WE WERE FOREVER CALLING THE WX BUREAU TELLING THEM TO UPDATE THEIR WX WHEN THEY WERE SLOW TO RESPOND TO MAJOR CHANGES. SOMEHOW; THE SYS LOST SIGHT OF WHAT IT WAS SUPPOSED TO ACCOMPLISH. MOVING AIRPLANES THROUGH THE SYS SAFELY. IN A CONVERSATION I HAD WITH THE ASSISTANT PDX TWR CHIEF HE INDICATED THAT WX WASN'T THEIR RESPONSIBILITY. I INDICATED HE COULD AT LEAST TELL HIS OWN APCH CTLRS AND MAYBE CALL THE WX FOLKS TO LET THEM KNOW WHAT WAS GOING ON. I WAS ALSO TOLD THAT WHEN I WAS VFR IT WAS MY RESPONSIBILITY TO AVOID TERRAIN EVEN THOUGH I WAS ASSIGNED A HARD ALT. I EXERCISED MY RESPONSIBILITY AND COMPLAINED ABOUT THE VECTORS. I REALLY DISLIKE THE ATTITUDE OF THE PORTLAND ATC MGMNT ON THIS ISSUE. CTLRS FREQUENTLY ISSUE HDGS WHICH TAKE VFR ACFT ON VECTORS INTO TERRAIN OR OBSTRUCTIONS AT OR ABOVE THEIR ASSIGNED ALTS. IT IS FREQUENTLY NECESSARY TO CALL 2 OR 3 TIMES TO GET PERMISSION TO DEVIATE FROM THEIR CLRNCS. I'M NOT ABOUT TO KNOWINGLY LET A CTLR RUN ME INTO THE HILL. HOWEVER WITH ALL THE MISTAKES AND CONFUSION THIS OPERATION CERTAINLY HAS THE POTENTIAL FOR THIS SITUATION.