I agree with Zeezee1 that the wife was way to materialistic, even when the death of her and her husband were on the line (especially after how she emphatically stated several times how she couldn't live without him).  I guess they could get the mobster for attempted murder (caught in the act no less), but it probably still wouldn't stop him from tracking them down (although since they were in the witness protection program they might not be able to charge him if they were relocating them again).  Also, why did the mobster go himself rather than send one of his henchmen?

Overall I still enjoyed the show even if it wasn't the best.