Normally, great things sell themselves. But, if no one knows about the existence of something great, chances of it selling itself become limited. This is precisely what happens to cars that would otherwise have been categorized amongst the greatest and most desirable but, due to poor marketing, end up becoming underrated.

In this regard, some most underrated car brands include:
1.OPEL eg:astra

2.SKODA eg:octavia, superb

3.VOLVO eg:s40, s60

4.MAZDA eg:2, 3, 6, etc

Volvo S60

fredodo911:
Normally, great things sell themselves. But, if no one knows about the existence of something great, chances of it selling itself become limited. This is precisely what happens to cars that would otherwise have been categorized amongst the greatest and most desirable but, due to poor marketing, end up becoming underrated.

In this regard, some most underrated car brands include:
1.OPEL eg:astra

2.SKODA eg:octavia, superb

3.VOLVO eg:s40, s60

4.MAZDA eg:2, 3, 6, etc

You didn't mention why they shouldn't be.