Don't underestimate how nice Retinas can be. My Retina IIIc (little c) has one of the sharpest lenses of any of the cameras I use. It floored me. I take this camera out over others if I'm shooting 50mm, want something sharp and compact.
Check these out at full resolution to see what I mean. The lean easily out resolves the films I've been using:
If yours is in salvageable condition and has sentimental value, its worth saving in my humble opinion.