Lol, no. Nasus still has a shit earlier game, but he's always had a decent lvl 6 all in with his ult, even before the changes making him gain more resistances instead of AD over the duration.
I'm talking early teamfight, not early game. Poppy had stronger early fight cheese, whereas Nasus tends to carry his cheese longer. Also, I never said Nasus had strong early anything.
He was garbage late game because once tanks got armor he wasn't able to do anything to them, even with the flat armor shred which couldn't be increased more because it'd mean he'd 1 shot squishies even easier, so a flash Q would instakill them even if he got peeled.
You're not supposed to tear up tanks. That's not your job. Who are these people who function as tank shredders only? The whole point of a tank is taking the damage for your team. You're playing into their hands if this is your playstyle. And if anything, being a burst AD champion (as opposed to the more DPS types) actually works toward tank shredding because it reduces the effectiveness of a couple of anti-AD tank passives, such as Amumu's E passive, Doran's Shield's, Fizz's passive, and the Tough Skin mastery, as well as anything that activates on damage taken, like the mastery Fearless. I don't know where it is that Nasus is so absurdly bad against tanks. No %HP damage or True damage, but his Wither and natural tankiness make him the anti-feed against other toplaners regardless, so you're generally reliable enough to make it to later game, where Wither and tankiness drive you through teamfights.
And since he didn't build much health and instead built durability in mr/armor, he'd be fairly squishy because he didn't gain much life back because his lifesteal was based on post mitigation.
He builds MR/Armor, like anyone else, to increase his durability. He has a strong natural HP boost in his ultimate, and powerful natural lifesteal to boot, on top of strong anti-DPS on his Wither. Of course Armor/MR are going to be stronger than straight health, and that doesn't mean he's anywhere near squishy when played right. It's probably related to the Cho problem, too, as people think he can stay squishy without Armor/MR simply because he scales with HP. However, his scaling with MR/Armor is arguably stronger (Feast is kinda busted) with scaling on passive sustain as well as high natural HP values, along with a huge focus on utility. Who are these other champions that scale better with Armor/MR? And please don't say 
... These champions have limited sustain values for their mitigation, and tend to function best as one-chance burst/hold champions. Getting scaling damage from mitigation doesn't mean much when other than that scaling, you end up running around begging enemies to hit you, and get limited additional utlility out of it.
And none of this says that Nasus is not weak right now. It's simply saying that he has the tools to do his job generally, and shouldn't be carried into other directions because his Wither is what is keeping him from being effective elsewhere. When these changes roll out, he's going to become strong enough over time that he's going to take a hit down the line, and he's going to be this weird tank-shredder character that makes no sense whatsoever, because everybody whined about being able to shred tanks, of all things. Seriously, why do you even want this? Just for early game? He's supposed to be weak early game, and build indefinitely, that's his purpose. You're asking for trouble, and sadly, you're going to get it fairly soon.
Overall, I don't understand in which way Nasus isn't built for his role, completely disregarding his E shred. He can focus down squishies with the best of 'em, and can likewise function as tank by focusing everyone's attention on him because of that power. The only reason he's having any problems is because tanks are now absurdly overtuned, and even so, he'll still end up with heavy influence if the team is built around it, like with just one of these oppressive tanks as jungle or support (even Galio mid). I guarantee that he'll get a nerf coming soon, and it won't be a revert, it will probably tear his purpose into an entirely different role (which may or may not be a bad thing). Main point is, they're shooting for a solution, and this will be a grand miss.
items have 1.5 seconds cooldown and in this case Nasus Q would have 1.2 seconds cooldown which means his Q wouldn't always proc Sheen)
We decided last patch that Nasus needed some buffs to his late game were necessary, but we clearly went overboard. To help balance his ult, we decided to shorten Wither's range by 50
