It was awful. Completely, cringingly awful. Oh, the animation was decent enough for a cartoon of the time, but in every other respect it was just plain bad. The plot of the mini-series was absurd, with improbabilities of all kinds and plot holes that a tank could drive through. The characters were either flat & interchangeable or ridiculously over-the-top. The leadership of Cobra was particularly susceptible to fits of insane laughter, which made them look dumb rather than threatening. The laser bolts flew fast and furious, except that even Star Wars Stormtroopers could shoot with better accuracy. Characters on both sides shouted their sides' catch-phrases "Yo Joe" and "Co-braaaaaa" with disturbing frequency. The humor wasn't funny either.
Now look, I didn't expect that it was going to be classic theater or anything. But it just wasn't any fun anymore. All those other cartoons I mentioned at the top, they're still fun. They still make me laugh. I still root for the good guys. But GI Joe? It just doesn't hold up. Disappointing but true. At least I still have the comic books.