Uhhh, Tomb Raider's franchise has gone into the toilet in recent years, the games stopped selling, to the point where they went ahead and rebooted the franchise with this game, and it looks and plays nothing like any of the previous games in the series. Basically no embargo is free advertising for them, since the game is actually good, and makes a fence sitter like myself go ahead and preorder for gimmicky bonuses or just because I wanna play it @ midnight.
Diablo 3 is Blizzard, What Blizzard game hasn't sold 10 million copies?!
In addition while it didn't really have an official embargo, Blizzard had no servers set up for anyone including the press so they all got it at midnight with the consumer, so there was no way for early review copies or scores. I think the core Starcraft fans whined about SC2 being friendly to new comers, it's really hard to know when to listen to core fans and when not to, most of the time if you're coming into the game it's a good idea to ignore them(DMC is a good example of a good game, that a core fanbase is pissed about that has nothing to do with gameplay) and listen to reviews, and D3 in this case reviewed well.
And Final Fantasy XIV was a MMO, so it didn't have an embargo in a traditional sense, but typically those games have reviews that come out later, so if you preordered or bought it you were stuck, word of mouth certainly didn't help it's cause, and it moved less then 1 million copies save for your hardcore FFXI faithful who were trying to convert to FXIV and stuck with it. Granted, there's beta and such, but FFXIV wasn't really setting itself up to topple any other MMOs or shatter sales.
The embargo is good for a game like Dead Space 3, the previews and demo show you it might still be scary, but an actual review will tell you it's more of an action shooter, so you get the sales of the old fans who want it asap, and new fans who don't care that it's not scary because they don't know any better.
Embargo also worked for Aliens, the demo they showed off @ E3 is amazing, lots of hype, lots of preorders, $100 special editions for a very terrible game that no reviewer can legally talk about until after they have your money. If reviews for Aliens: CM was out a week in advance, they would have lost preorders right and left.
I guess you could argue about whether or not reviews actually influence anyone to buy or not buy a game depending on when a review is released, but I certainly pay attention to reviews before spending my hard earned money on a game when it first comes out. Only exception to this is if I see a game on steam months later for $5.