Don't you like 2003 or it is just that 2012 and 1987 are better?
The one downside of the 2003 series, is how they made fun of the 1987 series in the Turtles Forever movie, which is why I ranked it so low.
I saw a few episodes of the 2018 series, and it felt mediocre comparing it to the first three...
When it comes to the TMNT cartoons, the earlier seasons of the 1987 series is the gold standard, while the later "red sky" seasons, which aired as part of CBS's Saturday Morning Action Zone cartoon block in the early-mid 1990s, were basically a way to cash in on the 1990 movie's popularity by making the cartoon dark and gritty (just like Batman: The Animated Series) with noticeable redesigns for the Turtles themselves, while incorporating footage of the first movie into the intro of the "red sky" seasons of Teenage Mutant Ninja Turtles along with a new theme song.
The 1987 series was also notable for being neutered of its violence in the UK and some other European countries back in the 1980s and 1990s, where they initially aired as Teenage Mutant Hero Turtles, since the word "ninja" (a type of Japanese shadow assassin clad in a dark mask and dark robes) has had violent connotations, as did the nunchuck weapons wielded by Michelangelo (which led to Michelangelo downplaying the use of his nunchucks as his primary weapon in favor of using a grappling hook in later seasons).
Those associations with violence no longer matter in modern day Europe and the UK, as those rules about cartoon violence put in place during the Margaret Thatcher era in the UK, they have been abolished by the 2000s.
The 2018 version of the cartoon did a great job capturing the Turtles' "teenage side," and making April and Casey Jones teenagers just like the Turtles, was a brilliant idea, plus it establishes that Splinter is the Turtles' father and ninjitsu teacher. Doing two crossovers with the 1987 TMNT was great, with 1987 Shredder, Bebop and Rocksteady returning in the sequel!
Those crossovers with the 2012 Turtles did better justice to the 1987 Turtles than the Turtles Forever movie, which made the 1987 Turtles look inferior to the 2003 Turtles.
The Trans-Dimensional Turtles and Wanted: Bebop & Rocksteady crossovers were TMNT crossovers done right, and they remind me of the Jimmy Timmy Power Hour Trilogy in their execution with a bit of Sonic Generations thrown in!
