Apparently, the servers go live on Monday and that's when reviewers are going to start playing/reviewing. That's what I've read, anyway.
Regarding Watchdogs, at least we got to play a ton of Destiny before it releases. As a result, I seriously doubt we're in for a similar situation. Plus, it became pretty apparent in the weeks leading up to Watch Dogs that it was gonna suck. I decided not to buy it well in advance of its release.
I'm not a big FPS or AAA-game guy, but I enjoyed playing the Destiny beta. I'm looking forward to the full game.