DominicCobb said:

The sheer amount of wasted potential is enough for it to be easily the least of the three.

There wasn't any wasted potential.

The main potential of this film (i.e. Luke's, Vader's and Emperor's subplots) was utilised to perfection. Jabba's subplot was great. Lando's subplot was good. Boba's death was good (Wild Bill style).

As for Han and Leia romance subplot, Lucas almost entirely depleted its potential in ESB and there was not much left for ROTJ. Considering this, they squeezed out the best they could. Ford and Fisher could act a little better but overall it is fine.