PC Gamer published a review of Counter-Strike: Condition Zero long before CS:CZ was released in stores. We know now that this was Vivendi's fault. Considering the court battle Valve and Vivendi are having, I wouldn't be suprised if Vivendi takes their sweet time in getting Half-Life 2 on to store shelves.
That said, I won't be reading the review until after I play it. PC Gamer's DOOM 3 review had a few minor spoilers, and I'm not taking that chance with HL2.