... It's widely known as one of the worst cars Ford ever produced...
Are you serious?!! I think the Maverick was one of the better vehicles Ford put out in the 70s. I had a '75 Granada... that was ***** as was that factory colon-extrusion with a 'Mustang' name-badge. And how can the Pinto be forgotten? The Pinto had a decent motor but it was like the Chevy Vega in that it practically started rusting on the showroom floor.
Anyway. To me vintage is age dependent. Something can be vintage but not necessarily desirable or collectible.