I would like to offer the following as a suggestion which might help to provide a more even playing field for solo queue players:
When any team which consists entirely of solo queue players, is matched with a team which consists of at least one group of teamed players, the following will apply:
The solo team players mini map will display the position of ALL players on the map (except enemy players in stealth) at all times.
IMHO As Anet clearly has no intention of ever reverting to Team and Solo queue- this simple change would (for any reasonable group of solo players) go some way towards bridging the hugely unfair advantage that pre made teams have over solo teams at the moment.