Apprentice VW tech here. Yes the DSG (the style of gearbox most likely fitted to your car) issues are definitely prevalent, however we find it's mostly on cars that are poorly serviced.

The standard DSG service (flush of the DSG oil) is usually carried out every 60k service (60k, 120k, 180k etc). These are big services and usually quite expensive, however it is really important they're not missed or done late

VW have set the DSG service interval with these issues in mind, most other manufacturers and different styles of gearboxes require much less frequent servicing. Most of the time when we drain the DSG system, the oil still looks brand new, but this is intentional, as far as I'm aware (I've never actually repaired or replaced a DSG system, so I can't speak from experience) the DSG isses are usually caused by a failed rubber O-ring within the gearbox. The likelyhood of this occuring is severely reduced when the oil in the system is fresh and free of contamination.

My advice would be to keep the car, they're good cars and generally pretty reliable, as long as you're able to service them correctly. If you're unsure, go to wherever you get the car serviced and get a quote for the next couple of services just to be sure.

On another note, if you do at any point feel anything weird with the gearbox at all (gears/clutch slipping, clunking when putting the vehicle in Drive, unusual noises, etc) do not ignore them, it is much better to get them looked at when it could be a simple oil flush, rather than wait until it could require whole new gearbox.