Beware of the "OK-but-not-great" date
Marriage is meant to be a lifetime commitment between two people, just you and your partner. That is hopefully what both of you are signing on for. It is not the kind of commitment that should be in place until you find someone great to replace the person what was just OK.
Of course, perfectionism can keep you on the sidelines for the rest of your life and this is not an encouragement to move to that extreme. But in evaluating who you will spend your time with you need to be sure that you are not settling for something you are not really excited about just so you won’t be alone. Settling is the quickest way I know to get married and end up lonelier than you ever were when single. You have to assume that if the person is just okay before the wedding cake is eaten, that same person is going to be just not okay on the other side.
Better to continue to seek for someone special that to settle for someone just because they are available. Pull back and reassess. You can always return to the relationship if it was really strong and meant to be and all you were experiencing were some cold feet.