Maybe good. This is pretty different to the the other anime stuff of Lupin. Actually, it's pretty much the opposite of Cagliostro, and Cagliostro has been considered the best thing Lupin by many, but this is actually a very good show regardless.
Truthfully though, this is the real Lupin. Cagliostro is as far from the real Lupin as it can get. Not that it's necessarily a bad thing, as Cagliostro is an amazing movie, but it's very Miyazaki-style (well duh, he directed it), so it means many things. For starters, Miyazaki never liked Lupin (it's quite far from the kind of anime Miyazaki does), so that's why it's very different to what the Lupin manga is, and also Miyazaki doesn't like Goemon, so that's why it has a minor role in the movie.
After Cagliostro, the Lupin anime became more lighthearted to a degree (which fits with Miyazaki's familiy-friendly production in a way ─ Cagliostro's success stuck to the anime, sort of), whereas the real Lupin is a grittier, more adult product, which is reflected in this newer show.
And in the end, you see many fans of the anime considering this show crap (for all the wrong reasons), whereas the fans of the manga are hailing this like a godsend.
Me personally, I enjoy both Cagliostro and this very much. They are very different and this is what Lupin really is, both can be enjoyed regardless. This is all just to say that if one watches this expecting what the rest of the Lupin anime production is (perhaps searching for another Cagliostro), they'll be disappointed, hence why it might be better that you haven't seen other Lupin things, but even if you have seen and like them, this can be enjoyed anyway if you can take the product for what it really is and is meant to be and not for what the rest of the production has become.