I have seen all of Dual!, and like the TV versions of Tenchi and Pretty Sammy, I'd say it's fairly restrained (compared to the Tenchi OAVs, that is). That's not true of the off-air 14th episode, which I rate as worthless for that and a host of other reasons.

To DK: I enjoyed Mike Mercury and his "Supercar" too when I was a little kid (*sigh*, giving away my age), but I think Thunderbirds is the Andersons' masterwork. It certainly is a whole lot better than their "Space 1999" disaster....