Like I said before, Rocket Power is actually younger a series than Spongebob by a few months, but I don't think anyone would be too happy with Nick shoving a show that's already on so many times on both Nickelodeon and Nicktoons into the special haven of 1990's retroNick shows. However, there's one show they've been running that ticks me off.
All Grown Up.
Now, I'm in a very unique place with this one. There are four Nicktoons I genuinely think are the worst (and since Nicktoons actually ran Mighty B, I've seen all of them at this point), Rocket Power, NFL Guardians of the Rush Zone, Fanboy and Chum-Chum, and All Grown Up. However, I don't dislike AGU because it's a bad show. It's not. It's definitely good for what it is, not a bad little series at all. But my beef is, it's howlingly unnecessary. Rugrats' humor was all in babies misunderstanding the adult world around them, all the while getting glimpses of the adult world for comparative perspective. Like Tommy being taken to the "Graham" canyon and thinking it's the pile of tires in the garage they were stuck in. And I do have this problem with post-movie season episodes that skewed younger and became an unintentional Muppet Babies clone. And I do agree the special where we were shown a "what if" to see what they'd be like as teenagers (and barely teenagers at that) was cute, but as a regular series...eh... it's just another slice of life type show Klasky Csupo was obsessed with back in the late 90's, early 00's.
And it's definitely after the 90's, this series. 2003 to be exact. How do I know? This is when Nancy Cartwright took over for Christine Cavanaugh, who retired in 2001. I know it's connected to a 90's series and all, but if they're going to add 2000 era shows, they might as well add the infamous series that appealed to older kids and got cancelled for it, Invader Zim. Heck. Gir is still a staple of Hot Topic.