*note* the Blues actually haven’t made too many bad deals at the deadline, so this will be a list of all bad trades.
The St. Louis Blues have been a bit more quiet at the deadline in the last decade, but during the Ron Caron years they were always making a flurry of deals.
Making a good trade usually depends on what you were trying to do at that moment in time. On the same account a bad trade can be determined by the eye of the beholder and has many determining factors, i.e. salary concerns, trying to acquire prospects or draft picks etc.