This is a silly thread
Whitebeard was the strongest, no one fought as many big shots as Whitebeard did at the war, he beat 2 giants, faced all 3 admirals, and the former shichibukai Black Beard.
Black Beard managed to pull off Whitebeards abilities because he'd already seen Whitebeards abilities so he copied the stances, but he had very little control compared to Whitebeard who constantly had to pull punches for his allies. Also note that Black Beard was threatening Archipelago soon as he stole Whitebeards abilities, while Whitebeard never got Archipelago involved with the same moves earlier. There may also be other rules as to how well Blackbeard gains mastery over others fruit abilities.
Whitebeard took far more damage than anyone else in that war, yet still stood his ground, all the damage the other characters took to take them down in comparison is nothing. Akainu comes second because he took the most attacks from Whitebeard. Also keep in mind the Admirals were ALL Logia fruits users, which let them pass through so many attacks and dish out so much damage while Whitebeard had to take all attacks and yet he still dished back, no one could with stand as much focus as Whitebeard took and survive.
That's why Whitebeard was known as the strongest man in the world at the time, he was out numbered by enemies but his strength alone was considered enough to win against the marines.
He never truly got thrashed by anyone 1 on 1.
Ace tried over 100 times to kill Whitebeard and failed back when Whitebeard seemed healthier.
Crocodile claimed he was a lot stronger when they fought too.
Truly the biggest reason he lost and died was because his health was failing with old age by the time this war happened, he wasn't at his peak fighting strength when he was forced into the war against the marines, but he still fought better than anyone else did in that war.
So don't belittle him. Or Ace's ghost will come and flame kick your ass! ;D