I know about Itachi he isn't that powerful. The Itachi vs Galactus thread was embarrassing. People overestimate him way to much agreed on that much. Still he is a boss and is still a very formidable threat on the level of the Sanin.
Okay I have to admit to not knowing that abbreviation. What is LT? Probably know what it is but don't know what the abbrievation is for.
Madara is a boss who is really high on the scale but agreed he isn't that high not even close.
What other feats can count? Naruto Characters only exists in Naruto Universe so by default it can only gather feats from itself.
Genjutsu is very specific just need to research it a bit.
That Uchiha Power being unbeatable thing is not meant to be taken literally every single time. The only true unbeatable power is Obito with DMS as if he absorbs his opponent he won. They can't get out and he can just let them starve in there. The only catch is actually getting them stuck in there...
Madara can't beat Thor, Superman, and all the ones you mentioned but that doesn't mean that he isn't powerful. Fanboys will be fanboys and overestimate their favorite characters. Batman has a similar issue to Itachi in being overestimated. They also do things they shouldn't in their prospective universes. I have come to expect both characters being grossly overestimated.
Just relax and enjoy the battle forums, you don't need to visit every Naruto fight, if you're that upset don't visit them its that simple a solution.