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I feel like right now kid's shows are a little more toned down due to all the PC and "family friendly" culture that's annoying. "Concerned parents" ruin the fun with their complaints. I don't think if someone made an edgy/dark cartoon, similar to "The Grim Adventures of Billy and Mandy" or "Courage the Cowardly Dog" or "Edd Edd and Eddie" nowadays it would get accepted on CN or deemed "appropriate" for children in general, which is kind of sad, but at least we have Adult Swim, now.
However the amount of episodes where the writers are incorporating their kinks into the material is a lot. Example off the top of my head: Raven gets a new costume and throughout the episode the animation is showing off her legs, I think they used the phrase 'thunder thighs' during the sequence.
Plus the amount of fart jokes are annoying. >

The show made me ill with all the gross out stuff when I watched it. This was a couple of years ago on an airplane so idk if I just watched a bad couple of episodes. >

The original wasn't "gritty" at all. Just a typical action cartoon. TTG is more slapstick, like Spongebob. Some people are into that. Personally, I think it's a dumbing down of kids' television. >

I feel the opposite, though. I gew up with similar cartoons, filled with slapstick, sarcasm, satire and other type of humour, often catering to the more "grown up" audience(by that I mean mentally as well). Even as a kid, I enjoyed them better than goofy childish stuff like Mikey Mouse. Examples: The Emperor's New Groove(Kuzko), The Grim Adventures of Billy and Mandy, Courage the Cowardly Dog, Garfield, The Sympsons, etc... Giving adults something to laugh along unironically makes cartoons better in general, in my opinion. I also prefer the TMNT 2003 series to the original, cause they're like grown up teenagers, rather than a goody kid's show.
I feel like making kid's shows too serious makes them too childish for smarter children that need something more "grown up". >

Love the 2003 TMNT. Not so much the new reboots.