Though many viewers of the original Teen Titans show believe that the lighthearted reboot known as Teen Titans Go! is not up to par with it's predecessor, there still seemed to be a mutual respect between fans and the people producing the show. Most of the voice actors were the same, the designs were more or less kept the same, even if given a more simplistic look, and although the stories weren't as dramatic and suspenseful as previous ones, it was still a good show for its intended age group. But then things changed in a recent episode titled The Return of Slade.
The name of the episode alone brought much hype from the community. Slade, aka Deathstroke the Terminator, the most terrifying and loved villain the series ever brought forth, even when compared to Trigon, Brother Blood, and the Brotherhood of Evil, was a very major presence on the original show, and fans have been clamoring for him to make an appearance on the new show.
Unfortunately, that was not the case. Slade was the center of attention at the beginning of the episode for maybe a minute or two, before it fast forwards to after the fight, with all of the characters commenting on how "satisfying" that battle was and Robin happily exclaims that Slade is done with "once and for all!"
Although Slade had a habit of reappearing after being defeated by the Titans in the original series, this really didn't have that feeling to it at all. It felt like the makers of the show just wanted to address the elephant in the room and get it out of the way as soon as possible, which in this case is what happened. It's possible that they were trying to honor the request of fans to have him in the show in a way, but that possibility does not seem very likely.