I can't think of a single special effect DS offered that made me look twice at it......still trying to think of one......
Well this question has to be looked at in the time DS was filmed. The technology and budget for the show back then isn't what it would be if it were being filmed today.
So you have to kind of forget about what can be done today with the special effects.
Which is hard to do I know.
But when you think about it DS was a pioneer in creating techniques to do effects that seemed impossible to do back then.
I read somewhere that some of the techniques used on DS is still in use today. Which is fasinating in of itself.
FireRose