1. well Oda developed the OP world so that an island with random stairs in the air is completely possible
2. he took gear 3 from Tom&Jerry not g2, so what? Oda has a TON of references to other works, stories, real life history, ... it just makes it better
3. Luffy could go out because of Bellamy, read the chapter

already posted that once for you
Kishi maed a world with a lot of restrictions and was then unable to write the story in the world he created, he dug his own hole.
Actually Madara being able to use Susanoo without Sharingan would be teh equivalent of someone whos DF has been extracted would come and be still able to use the DF power, if that happened fans WOULD notice. Kishi goes into details and than forgets they are there, Oda created the concept pf the Devil fruits exactly so that he would be able to do crazy stuff with it, he doesn't need to give us more details with DF's in general because there are none, as simple as that, no point at making little detailed restrictions if you are just gonna break them.
well the ratio of content:discontent on the internet is in favour of discontent (by a LOT)
actually Naruto has quite bad character development because he as a character is so inconsistent, first he was supposed to be an underdog who had to work hard to become anything and because he was a noone he wanted to be recognized. But slowly things started to fall apart, he got taken under the wing of a living legend (qhich is quite a privilege, by that I mean Jiraiya), than we ''find out'' he is the SON of the 4th Hokage the hero that saved everyone in the village, than we find out his mother and the Uzumaki clan has ties with the Senju, we find out he is the child of prophecy, ... from an underdog story he has becom the most privileged kid in the entire Narutoverse, hard work? c'mon is this a joke?? And his goals arent consistent either: I wanna be acknowladged, I wanna be Hokage, than I want to save Sasuke for you Sakura, than I want to save Sasuke so I am worthy, I want to bring peace to the world, ... -.- Naruto has developed but not consistently with what he was supposed to be in part 1. And above all we find out that the fox inside of him is a goody good guy which kinda makes the whole ''Naruto isolation because he has a monster inside of him'' just weird in retrospect.
Some antagonists are quite explained in Naruto yes but the current 2 villains are just weird, everyone likes Madara because he is a badass but it's never been properly explained why he is doing all this, and Obito just plain sucks (Rin -.-) and there is the matter of consequences for one who literally started a world war and killed oh so many ppl ... now a hokage and a jounin are actully his body guards it seems, like wtf?
Naruto characters have developments but way too many end up forgotten and abandoned, and some of them are quite inconsistent
not enough to catch up to OP worldwide though