Okay. Prepare for some hate, but I promise, I am going somewhere good with this. Ahem.

Ninja Storm. Aside from Zurgann there is NOTHING redeemable about this season. You turned Sensei into a Guinea Pig, Robo-Cam, Lother's Neice's were just Annoying, and the whole story seemed to go around in circles. And make little sense.

It just needs minor tweaks though. Like with WF have Sensei kidnapped by Lothor at the start of the season. Leaving Cam to become a Mentor to the Wind Rangers, opens up a whole story of him needing to believe in himself. Which leads to the Samurai Morpher. Which he can still get in the same way. Destroy the Neices. They were annoying, and the worst part of an abomination of a season. Do away with the Semi-truck to, and the one in Dino-Thunder. Just saying.
That's all though. The acting was good in this season, honestly. The only thing that felt forced was each of them being into some sort of extreme sport (Surfing, Skateboarding, Moto-X). Wouldn't take much to make this a good season.

Power Rangers Samurai
The series is a franchise "reboot" after Saban Brands reclaimed the rights to Power Rangers from Disney.

Why Change It?
Power Rangers Samurai is one of the rare examples of a faithful adaptation to the source material being the wrong solution. In the past, this practice worked in Time Force and Wild Force, but the main problem is that Samurai Sentai Shinkenger is culturally impossible to directly port over into a western environment. The premise of a Samurai lord and his vassals works in a Japanese show, but with Americans, it doesn't make sense. In addition, character traits in Shinkenger were very crucial to many storylines. For example, Ryunosuke's background as a kabuki actor was invaluable in foiling Dayuu's bride-kidnapping scheme. Kevin's background as an Olympic swimmer has nothing to do with the series; as a result, the PR Samurai version of the bride-kidnapping episode lost its punchline.

Oh yeah, did I mention that these people can't act their way out of a paper bag?

What Would I Change?
The first thing I'd change would be the most obvious: the actors. Get people who can actually act instead of just standing there and reading the cue cards, hoping no one would notice.

Second, just make a completely different story. Instead of them having their powers handed down from past generations (which doesn't make sense, given that they're not Japanese), just have them stumble into a cave and find ancient relics that give them their powers. That always works, doesn't it?

And lastly, drop Bulk. Sure, he was added to the series for nostalgia's sake, but he's nothing but episode filler, and Spike is no Skull.

I agree with everything that Area said except the Bulk part.
Honestly, his bits are the only reason I watch Samurai anymore.

Power Ranger Dino Thunder

This is an old school one, it's the only season I've ever said "I can do better" because when abaranger was early in it's run I saw an american adaptation laid out clear as day. and posted it to RB LONG before it ever aired. some of my idea matched up with thiers some didn't.

What would I change?

First off Jason would have been the returning Black ranger rather than Tommy, this would have allowed the character Emily "easily recast" to have played the same role Asukas wife did in Abaranger, pretty much the only thing that I would have borrowed from the sentai. this would have allowed some pretty extreme motivation for Jason.

The three kids would have been pretty much exactly the same except for a scene about a third in where they break one of Zordons 3 rules (which Jason tried to immpress on them) being to not use thier powers unless a monster attack, right after a megazord battle they try to stop a purse statcher (Or some other random petty crime) and end up putting the guy in the hospital due to how strong the suits make them by default. this would have lead to a story arc involving a fair bit of continuity with the larger universe. threads aside, Tommy would have returned as the white Ranger, not evil....but under some false assumptions which eventually would lead to him joining the team, but it also would have resulted in those ASJ and JDF getting to play themselves on camera with the rivalry we've heard about.

Third change, thier command center, the intro to the series would have found Jason VERY suddenly having powers and in the mentor role, no prep time, no fancy multi-million dollar command center, this would have been his basement with all the Radio shack gear they could fit on his credit card, would be VERY lo-tech.

The Villian. Mezagog is out. The villian I picture was a totally diffrent Ballgame, Zordons son, whom has set up shop in Zedds old castle. The Dino Thunder powers were Zordons great back up plan. in case this kid ever came back. and this kid is Horrifying., He is insane in the truest sense of the word. switching from an almost childish nature to straight up evil in the blink of an eye, his deranged mental state also accounting for the haphazard nature of the monsters.

the series also would have explored the nature of "delving deeper" into thier powers, something which was in the final cut. given the fact I posted a very large story treatment at a point that would have been very early in DT production I like to delude myself into think that idea did come from me.

It's not all that bad. Honestly it's been one of the best seasons we've had in years.

That's arguable. The only Disney seasons I think that are worse than Samurai are Ninja Storm and Operation Overdrive.

Oh Compared to freaking Ninja Storm this season is Shakespear.

I don't know why anyone has offered to abort Samurai. My first choice would be operation overdrive minus the once a ranger story arc. My second choice would be parts of samurai, like Jaden's hair, kevin, emily (prity much everthing ecept for miike, deker and mentor. AND THE PUNS HAVE TO GO)

Two things Shin. First, your sig has to go. Takes forever to load.

Second, I agree with aaaaaaaaaaaaaall of this. Except Emily. Emily and Mia stay.

Mentor has to go in Samurai.

He's Emperor Grumm from SPD! It's all a lie! Allllll a lieeeeeeeeeeee