No, Hayao Miyazaki can do no wrong. Ghibli has released a few mediocre films from other directors. The worst being Tales from Earthsea by Hayao's son Goro.
This is from a new director for the studio so we'll see. Looks great as usual at least.
No. Miyazaki has made a great film since Spirited Away. One could argue he made a "good" film with Ponyo but that's highly debatable.
Having seen this one twice in the theater already, I can say that this is Ghibli's best film since Princess Mononoke. It's got this sense of wonder while having some downbeat undertones. Probably a bit too slow for the kiddies, but an excellent film all-around and one that I hope doesn't get overlooked because It's Not Miyazaki (nevermind that he wrote the script/"supervised" production)
My young daughter watched Nausicaa (a 20+ year old film) and loved the hell out of it, she's watched it about 5 times now. Somehow that tells me there is nothing about the film that needs to be remade or modernized.
Besides I don't think Miyazaki's in the business of remakes.
Easy there internet tough guys. The original movie was fine for it's time and it stands on it's own. But there's a lot that happens in the books that would make a spectacular mini-series at the very least.
Now if they could just fix those hideous character faces and inconsistent as fuck, jittery animation that's made every Miyazaki film nearly unwatchable for me.