With imports, freshness is always a factor too. I remember a time thinking I didn't like helles because the imports I drank were usually oxidized, with the unpleasant strong caramelly character. Until I found some Paulaner Premium in cans (never found it in cans since), stamped fairly fresh considering the distance, and with obviously no light struck issues. It was absolutely fantastic and totally changed my mind on helles. Been a while but I think the next beer I brewed was a helles.