Sorry, folks, but I think the OP is either a troll or essentially "as clueless about the Internet as he is about automobiles."
He's been in here before -- mentioned that a Toyota rep stated that any "vibration" was within specification. He's been in Edmunds, too, with essentially a word-for-word repeat of what he's written here. "Or vice versa."
He never describes the vibration in any detail at all. "When does it happen -- at high speeds on the freeways? During slow-speed turns?" And so on. Not one single word.
He never replies to the many replies he has received -- he just pops in to dump a "Camry bad" post.
So, I sure can't put much stock into this guy's "problem." If he's actually genuine, then I expect he might well be the kind of "customer" that service people roll their eyes over -- you know, the kind of guy who goes, "I've taken my car in three times for rattles -- can I get a new car under my state's Lemon Law?" And other such nonsense.
Well, let me tell you -- I sure don't head to a Nissan dealer looking for "quality." I truly expect that this guy will show up on some Altima forum some day with some other vague story about why people ought to avoid that car, too.
So, "I call this guy's bluff." If that bugs him, well, I challenge him to describe his "problem" in more detail. That's what it would take me to believe him.
Finally, for ANYONE whining about "vibration" problems, I just have one painfully obvious question: "Why don't you take it to a competent tire shop, and see what THEY have to say about it?" I would think that a "second opinion" like that would be valuable thing to get, even if it cost you a few bucks....