The Crew requires you to be online at all times, and is also primarily a multiplayer game, so I understand why they aren't sending out copies.
MMO's are never rated before release, and The Crew is probably the most MMO-like game in its genre.
If the servers aren't on, you can't play, and they probably won't turn the servers on until launch.
Lately reviewers aren't reviewing games until they can fully test them, such as IGN and Nintendo Life refusing to rate SSB:Wii U until the servers came online. Therefore it would be pointless reviewing The Crew, as there would only be a (very) few people online playing it even if the servers were online.
Tens of thousands of people have played the beta on PC, PS4 and XBO, so Ubisoft have nothing to hide, just talk to someone you know who's played the beta, you'll get a more reliable image of the game from them than you would from a reviewer anyway.