TL;DR: this anime show exactly what you should do if you want to fail.
Lupin VIII is the adventure of the 8th generation of Lupin. Because this pilot was juste a pilot, there aren't voices. But that's not a real problem.
You need first to know that this anime was a collobaration between the Japanese studio and... a French studio.
First error: going on the Land of Arsène Lupin where copyrights would not let you do whatever you want.
The history is a total change of Lupin. All the characters were "Westerned" for fitting the "Western Audience". For an anime which already was quite "good" in that regard.
a thief, but now a detective. Why not? Arsène Lupin in one of his story actually played the detective, and even in Lupin III you've a bunch of detective stories.
Jigen is totally changed, he don't smoke anymore (well, given the situation of France during the time it's normal, you can't put someone smoking), but now he got a... lollipop. He's not anymore the ol' Jigen, and that's very strange.
Goemon now use a laser sword...
Finally Zenigata don't have a reason to exist anymore. He is merely a rival of Lupin, because of Lupin III vs. Zenigata. He carry now a pipe which isn't "real' (it's a communicator), that's probably a reference to Commissaire Maigret a famous detective.
Globally this episode is very weak. The "story" could have been good, but it's just a lot of changes which aren't how Lupin III is. All the changes just make this bad, and laughable.
You can watch it, if you're watching all the Lupin. Or if you just want to watch an episode of something badly made. Idea of doing a Lupin in futur as a detective could have been good. Even though being a thief is good for "being a hero" (let's remind us about Arsène Lupin! He's a thief and he was well accepted by the people!).
All the changes to be more "western" are where the thing went bad.
5/10. Because the had good ideas, and he's still... a Lupin.