Ask to see whole weddings, not single frames
A portfolio is a selection of the best images from several years. It tells you how good someone is on their best day, not what an ordinary Saturday looks like. So ask for two or three complete weddings, start to finish.
Look closely at the hard parts: the ceremony, speeches over dinner, the evening when the light runs out. Do they hold the same level as the golden-hour couple portraits? Check the guests’ faces too — a photographer who only shows the couple leaves you without half the day.
If a photographer cannot show one single complete wedding, that is an answer in itself.