This is gonna have something for everybody well maybe....
1st the 4th hokage was considered the greatest because he was able to address and situation by being caught of guard and already have a solution to the answer already and he had the talent to back it up...when anyone talks about the 4th hokage they mention an fraction of his talents but they never jus stop at one but obviously they constantly mention his speed which in any case everybody knows that you dont get that kind of rep buy jus talking about someone these people actually experienced it all these threads are usually to bring the top rank ninja of all time and i dont see no point in doing that let him have his glory and on top of that the 4th was so strong that they had to kill him off before the show even took its course i mean come on now all you see him is in flashbacks and that one time he talked to naruto but thats all he did was talk fanboy or not i give credit when credit is due....
2nd itachi was also a great thinker too had the eyes and the stamina to back it up i never once seen itachi lose his cool because he was well aware of the danger that brings not to mention the he thinks aleast 50 moves ahead head tobito confused about his true motives was able to place insurance in naruto broke free of the edo tensei took out pains techniques and only seen it for the first time the list is endless yall know his abilities...
3rd shikimaru low chakra level shinobi but the way he's able the get himself out of an tight jam is nothing short of amazing during the oringnal series he played the decoy without fail during the exams was able to make temari who is also an well thinker look like she was jus a lil gurly that plays with fans all day and complains about her nails and make up lol during the saskue rescue was the leader and came up with the perfect stagey to make sure everyone was well covered at all times then not to mention the hidan fight dude is just awesome
Kakashi is self explantory
Saskue is great when he's level headed when he strayed away from his roots and thought he was the shit he almost got killed on like 7 different occasions
Naruto may come off as an idiot through normal conversation but on the battle field he can be considered among one of the greats
Stop hating on talents and trying fo put a charcter down just because someone is their fan if everybody like the same charcters then the show would be useless and a big flop
Anything i missed feel free to add thanks for reading...i kno it was a lil long
And on a side note i dont think madara is going to be beaten by one person its going to take the whole allience to take him down in case yall forgot everybody is on their way ro where naruto and the fight is so they are going to play a big part in this fight