Okay, Power Rangers Turbo is commonly hated throughout the fandom. However, there is only one reason really why it's hated, and it's all because of one character. Everyone's favorite Blue Ranger, Justin.
I'll get to Justin soon, but right now, I wanna start off with the movie. The movie is just, terrible. It just feels like a really boring four parter. You never feel like there is a real threat. Maligore ends up being wasted. Divatox comes out of nowhere and you have no real reason to see her as a threat, Lerigot and his subplot is annoying. Jason and Kim coming back were horribly wasted. And the pacing is terrible it's just so boring. Also, there really isn't a good transition from Zeo to Turbo, unless you count Scorpion Rain as the transition or no explanation on who made the Turbo powers. There is, however, speculation that Billy created the Turbo powers before he left for Aquitar. I have no idea what to believe, but I'm sticking with that and Scorpion Rain.
Now let's talk about the original material, Gekisou Sentai Carranger. Carranger ended up being a parody of the Sentai franchise due to Ohranger's ratings and such. The producers and writers had a totally different plan for Turbo. They thought of a dark season for Turbo. However, it backfired. The first half of Turbo really seemed jarred so much with the Carranger footage. It stripped the comedy out of the Sentai, and attempted to continue the previous year's serious bent. Groundwork was laid for the old villains to continue. Every episode followed the new, grittier Power Rangers formula of searching for bombs before they exploded and killed lots of people. It's just pointless fillers and has one of the worst hand offs in Power Rangers, the episodes "Passing The Torch." And continuing with the old rangers mixing one new ranger together didn't really seem to clique. The second team was better with Justin. Also, Bulk and Skull turned into chimps was a weird subplot.
The second half of Turbo seemed to handle the Carranger footage more properly. Carefully weighted plots, episode-driven yet laying slow groundwork for the next year. It excelled at off-center scenarios that gave the episodes really different flavors, and had the best season cliffhanger for any Power Rangers show, ever.
People tend to blame Turbo's failure because of Justin. However, looking at Justin now, he's not a bad character while not my favorite. Like, I've never understood the massive amounts of hate the fandom has for Justin. So he's a kid...so what? It's like hating one for their race and/or sexuality. It's totally dumb. It's not the character's fault that the producers wanted to have a kid for a Ranger. People call him whiny and childish and this or that, but really...what do they expect a 12-year-old thrust into being a superhero to act like? I doubt the haters would've reacted any differently in his shoes. Heck...I think Justin acted remarkably mature for his age, all things considered. I can't exactly say that about the haters.
Was I sad to see Rocky go? Absolutely. I enjoyed his character immensely, and he was part of the great chemistry the team had together, especially in season 3 and Zeo, not to mention the way he was written out really left something to be desired. But I'm not going to begrudge his replacement just because of that. It's the nature of Power Rangers to change in some fashion every year, and you just have to learn to accept it.
I don't like Turbo, but I don't hate it either. It's an okay season, but the second half of Rangers is what really made this season what it was... at least in my opinion. Their episodes dealt with the Carranger footage better and it went from serious to campy, which made it slightly more likeable. Not that it wasn't but there's just something about the campier half that appeals to me more. XD It's still the "resolution" season for me as it leads into the "conclusion" season of Power Rangers in Space. Also, it's got the best theme song for Power Rangers, ever! 8D