My apparently unpopular opinion judging by past reactions:
I think they should have used Kyle Katarn and Jan Ors in Shadows of the Empire instead of creating Dash Rendar and Leebo. Kyle and Jan were already mercenaries working for the Rebellion with big accomplishments under their belts and they were active during that period. Instead we got a Han Solo wannabe that was as interesting as a slice of bread.
I always liked Dash Rendar, and Jon Knoles gave the best description of what differentiates him from Han Solo, that Han ultimately isn’t as tough as he appears whereas Dash is the really rough guy.