CLOSE IN APCH CHANGE AT MCO BY A320 CAUSES CONFUSION AND DANGEROUS SIT AS CONFLICTS ESCALATE.

Narrative

DSNDING INTO TO ORLANDO (MCO); APCH CHANGED OUR RWY FROM RWY 17 TO RWY 18L AND TO EXPECT THE VISUAL. THE CAPT WAS FLYING DURING HIS IOE AND HE ASKED ME TO SET HIM UP FOR RWY 18L APCH. WE SAW THE RWY; AND APCH CLRED US FOR THE VISUAL APCH; MAINTAIN 180 KTS AND CROSS MCO VOR AT OR ABOVE 2500 FT MSL. THE PF CONFIGURED THE ACFT AND WE WERE XING THE MCO VOR CO-LOCATED WITH ORLANDO EXECUTIVE ARPT AT 2500 FT WHEN WE RECEIVED FIRST A TA OF TFC AT 10 O'CLOCK POS AT OUR ALT. THE TA THEN CHANGED TO AN RA. THE PF DELAYED SLIGHTLY DUE TO CONFUSION OF DISPLAY. I ADVISED TO PULL AND GO AROUND WHICH THE PF DID. ENGAGING GAR MODE OF THE AIRBUS AT A HIGH ALT CONFUSED THE PF AND I HAD TO TAKE THE AIRPLANE TO PREVENT EXCEEDING FLAP SPD AND FLYING ABOVE OUR CLRED ALT GIVEN TO US BY APCH. AFTER RECONFIGURING THE AIRPLANE; APCH AGAIN BROUGHT US AROUND FOR THE SAME APCH TO RWY 18L AND AGAIN WE RECEIVED A TA XING THE MCO VOR AT 2500 FT; BUT WERE ABLE TO COMPLETE APCH AND LAND. THE PROB IS XING AN ACTIVE ARPT AT 2500 FT; ALL PLTS WILL HIT THE 2500 FT ALT DUE TO IF HIGHER WILL BE UNABLE TO COMPLETE APCH AT MCO DUE TO MCO BEING ONLY 4 MI S OF VOR AND ARPT. THIS IS IN MY OPINION AN ACCIDENT WAITING TO HAPPEN. AN ADDITIONAL FACTOR IS LACK OF TRAINING BY AIRBUS OR COMPANY IN PROPER WAY TO DO A SOFT GAR WITHOUT ENGAGING GAR MODE. TO GO TO FULL GAR GIVES TOO MUCH PWR; RESULTING IN EASY FLAP OR ALT EXCEEDANCE.