I hate to break it to you but...
High SO rep != goodgreat programmer
Actually, many of them are. However, there are some users that are on the site so much, answering so many questions but their average score per answer is very low yet that still have a 5 digit rep due to their high activity.
If there's enough data there, an interviewer could possibly read answers to gleen insights into their approaches to solving problems but to go on straight score would make a company look downright silly.