Mack Hogan

2020 BMW M850i Gran Coupe Source: BMW With an ever-expanding series of products that fill every niche, BMW should have one of the most well-rounded lineups in the automotive world. The company offers family SUVs, stripped out sports cars, and bulbous four-door crossover coupes. The trouble is, with so many different models, it can be hard to differentiate each individual trim.

The 2020 Nissan Titan. Mack Hogan | CNBC In the ever-growing full-size pickup truck segment, no player is as often forgotten as Nissan. The company's Titan truck has been around for over 15 years but has never achieved the blockbuster success that trucks from American brands enjoy. Even Toyota's Tundra trounces the Titan in yearly sales. Part of that comes from long-entrenched loyalty American companies have instilled in truck buyers. No other segment is more roundly dominated by U.S. automakers.

The 2020 Cadillac XT5. Mack Hogan | Getty Images The Cadillac XT5 is one of General Motors' quiet success stories. It's not the flashiest or best-known luxury vehicle in its class, but it's consistently one of the bestselling luxury vehicles in the country. On the face of it, that makes sense. The XT5 is an approachable, comfortable way to get into a luxury SUV. But its commonality betrays its biggest weakness: despite being a competent option, it ultimately fails to stand out in a crowded segment.