While it currently appears Consumer Guide loved the Plymouth Valiant and Dodge Dart the most among all the used cars from the 1970s, the Ford brand was preferred as a whole. Sure, Ford had its issues—especially with overstyled sedans in all classes, and being late to the downsizing party—but it seems build quality was higher and recalls were fewer.
Does that also hold true for Mercury?

Most models were shared together, so possibly. But we also know distinctions can exist depending on engines and options. Let’s take a look at Mercury, then you can compare the below ratings with those for Ford. Please note the CG rating scale of 5 being Excellent and 1 being Poor.
Mercury
“Lincoln-Mercury cars have set new standards for quiet operation and comfortable rides.”

- Bobcat: “With the smaller engine [four-cylinder versus the V6], Bobcat owners can have the power train that has the best overall repair record in the American subcompact class.” CG rating: 4
- Capri (Import): “Capri’s repair history has been precisely opposite that of the Pinto, despite identical components.” CG rating: 3-4
- Capri (Domestic): “Overall repair record for ’79 models slightly below average with standard four, dismal with V6.” CG rating: N/A
- Comet: “Dull but dependable, and a safe choice among compacts of the early ‘70s.” CG rating: 4
- Cougar: “Repair record average to slightly below average. Electrical, brake, and suspension crop up in [early cars]. The 1974 through 1976 Cougars have above average repair records. It appears the newer [1977] model is not holding up as well.” CG rating: 2
- Monterey/Marquis: “The cars have excellent service records and live up to their images of quiet and comfort … but Marquis is a leftover from an age that is about to pass.” CG rating: 2
- Monarch: “Like people, there are cars that make great first impressions, then quickly wear out their welcome. The Mercury Monarch is just such a car.” CG rating: 2
- Montego: “Overstyled, overweight mid-size car with too much thirst and too little practicality.” CG rating: 2-1
- Zephyr: “Sketchy frequency-of-repair data, but overall record is average so far with either four- or six-cylinder engine.” CG rating: 4-5