If Sidious is the strongest Sith, how it comes he was defeated by Mace Windu? 😛
I also see Lucas's comment:
"But this part where he pretends to lose his power and be weak was something that I added later." -George Lucas
So I see that Lucas retconned Sidious for holding back on Windu, and said now he lost his power and was weak.
So he retconned that...
Now that's just a non-canon version of Sidious faking the fight.
And don't forget movie canon it's always over novel canon as the movie it's the exact Lucas's vision, books are always with input of another author. 
And at "Sidious is the most powerful Sith in history"
People are dumb. They just think that Sidious is the strongest Sith because Lucas said that once. It doesn't affect the actual Star Wars universe.
I don't really get that. Sidious wasn't really a Force entity. He was at best, just a powerful Sith.
The idea that Palpatine and Luke were the strongest Sith and Jedi to ever live. That's just stupid and ludicrous. It's based entirely off of comments made outside the Star Wars Unicode.
Originally posted by Freedon Nadd...Sidious destroyed imperial/rebel fleets with force lightning.
If Sidious is the strongest Sith, how it comes he was defeated by Mace Windu? 😛I also see Lucas's comment:
"But this part where he pretends to lose his power and be weak was something that I added later." -George Lucas
So I see that Lucas retconned Sidious for holding back on Windu, and said now he lost his power and was weak.
So he retconned that...
Now that's just a non-canon version of Sidious faking the fight.
And don't forget movie canon it's always over novel canon as the movie it's the exact Lucas's vision, books are always with input of another author. 
And at "Sidious is the most powerful Sith in history"
People are dumb. They just think that Sidious is the strongest Sith because Lucas said that once. It doesn't affect the actual Star Wars universe.
I don't really get that. Sidious wasn't really a Force entity. He was at best, just a powerful Sith.
The idea that Palpatine and Luke were the strongest Sith and Jedi to ever live. That's just stupid and ludicrous. It's based entirely off of comments made outside the Star Wars Unicode.
Originally posted by Jmanghan
...Sidious destroyed imperial/rebel fleets with force lightning.
That was a wormhole, not Force lightning...
So, what if he conjured a Force storm(wormhole)?
Nihilus's Hunger devoided strong planets in Force almost instantly. Katarr had even the buildings destroyed, and that only because of his Hunger.
Nihilus's Hunger>Sidious's Force storms
Of course that wouldn't mean I would call Nihilus stronger than Sidious, because there's no way to compare Nihilus with the rest of the Sith, and all that 'cause he is the Void personified.
In his Dark Side Book he says nothing about raw strength in the Force, only *Will and Anger combined* at perfection, or something like that, besides that he never had full control over them, it was just his boasts.
Also, a wormhole doesn't indicate Sidious's strength in the Force, because a wormhole it is conjured by concentrating deep into the dark side of the Force, playing with the dark side energies around and unleash them in a volatile burst.
The Force storm itself destroyed those fleets, not Sidious himself.
For example the DarkStaff had the same ability, and since that device appeared before Sidious, it tells us that someone in order to build such an aparatus had already that knowledge and the prowess to do it, but wanted instead to make a device which could be used in a few seconds.
To conjure a Force storm it doesn't take raw strength in the Force to do it, but deep concentration in the dark side followed by Will and Anger combined.
Originally posted by The_Tempest
Always got a kick out of that argument: Sidious didn't kill a fleet, his Force storm did.Nihilus didn't eat Katarr, his Force drain did.
Nice try... 😉
But the Hunger(stop calling it Force drain) is what gave birth to Nihilus...
Nihilus didn't need preps, concentration or such things, he acted out of pure instinct, that was his nature, the nature of a rift in the Force.
He doesn't activate the Hunger, the Hunger it is always there, he became the "Hunger"...
You know, it is a difference to be a walking Void or a walking "Force storm"..., it is not like Palpatine could generate wormholes one after another continously.
Originally posted by The_Tempest
Sounds like a lot of unsupported fluff tbh
Well I gave your already a feasible explanation, moreover Sidious in his Dark Side Compendium already says that it is only about Will and Anger combined at perfection with intensive concentration into the dark side and manipulating the dark side energies which surround you, in order to unleash a volatile Force storm.