Destiny had one, I don't think it is a good sign...

Driveclub doesn't have one.. It lifts in 1 or 2 hours if i recall correctly, not at release.

Problem is, still very, very late. A few hours before release does not bode well, since it means that the publisher did not expect the reviews to create positive hype. We'll see though, I've been wrong before. 

That still means there is an embargo ..

Some people are already playing it, and are praising its gameplay. That doesn't sound too bad to me.

There always is on any game

People loved the first few hours of Destiny when they played the beta too. There is a lot that could go wrong, i.e not enough content on release, rigid gameplay, repetition, etc. that would be hard to pinpoint after just a few hours of playing. 

Like I said though, I might be wrong. From my experience though, almost every game that has a review embargo has turned out to have less than stellar reviews. There is absolutely no reason for an embargo if you are comfortable with the game reviews, since even halfway positive reviews generate a ton of hype.

It does seem to have one:

http://www.neogaf.com/forum/showpost.php?p=133061702&postcount=5724

http://www.neogaf.com/forum/showpost.php?p=133043447&postcount=5565

Sneak peak - our score for @DRIVECLUB + remixes by @Noisia_nl @djshadow @TheQemists & more will be released on iTunes on 7th October

— H Y B R I D - Official (@HybridBandUK) October 1, 2014

We'll see, I remember reading Monday, not Tuesday.

Btw not a review but a Eurogamer Spain staffer said this is his favorite racing game of the year.

I dont have a good feeling about this.