They were pretty good. Both of them. I don't want to spoiler too much so just some quick thoughts:

The Rocko special is very meta. It also has a "LGBTQ" tag on it when I rolled my mouse over the thumbnail for it. I don't want to reveal why, but it was very well done and elevated the special. There's also a literal ghost in the episode I found hilarious.

The Zim special was great too. Very funny. Now I know why Membrane hates sharks. I'm not sure if there will be future installments, but if so I hope the new addition to Gaz's and Dib's family is permanent. There are also puppets in the special. Actual live-action puppets, not animated. So it has that going for it.