You should only choose your wedding photographer if you like them and love their portfolio !
Why? Because you are trusting them to capture a day in your lives that can never be repeated, you will spend more personal time with them than any other professional person involved in your wedding day.
You will never know what your wedding photographs will be like until after the wedding, so you need to make sure that you take every precaution to choose someone that has technical as well as artistic skills.
Prepare for the worst and hope for the best is not something a bride and groom should be thinking about with their photography, instead they should be thinking - Expect the best from my photographer and I will hope for the amazing that only they will bring on the best day of our lives.