Red Dead is by no means "one of the best". Nobody has hailed it in such high regards as Zelda: OOT and Final Fantasy 7 (though I didn't much care for FF7 myself).
It surpassed A Link to the Past, Super Metroid, ICO, and Shadow of the Colossus to take the number one spot on my all-time favorite list.
I think it was pretty ignorant to say "nobody" has nailed it in such high regards, as I'm sure tons of people have. However, it'd probably be safe to say that the general consensus of RDR is that it's amazing but not quite at the status of the other games flame mentioned.
All that new info does make the new game seems amazing, almost overwhelming, but I remember the same feeling when info was released about GTA IV. Some stuff was hyped up to be more fun and involving than it actually was. But regardless I know it was be an awesome game and I'll get it day 1.
Best game ever? I'd be surprised. GTA is one of my favorite series and I know it will be one of my favorite games this gen, maybe ever. But definitely not my favorite game ever.
Dear Society, Please stop calling Justin Bieber gay. We don't want him either. Sincerely, Homosexuals.