600Hz doesn't look bad on plasma, though the 120Hz/240Hz soap opera effect on LCD/LED does look terrible.
If something is filmed and made to be played at an extreme refresh rate then sure. But as others have said, 600hz in TV's aren't showing 600 images per second, it's a marketing thing referring to other components.
But regardless of screen, interpolation never looks 'good' it's wonky and almost cartoon like as the media wasn't made for it. If it was filmed for it then sure but if not leave it as intended, is just my opinion on it.
PS4(PS5 Soon)and PC gaming
There's only 2 races: White and 'Political Agenda'
2 Genders: Male and 'Political Agenda'
2 Hairstyles for female characters: Long and 'Political Agenda'
2 Sexualities: Straight and 'Political Agenda'