It appears Vivendi’s game division is relying a bit too much on the sales of World of Warcraft, with a not-insignificant revenue drop of 11 percent from last year.

A company statement read; “A comparison of the first half of 2007 and the first half of 2008 performances is not representative because first half 2007 included the hugely successful release of World of Warcraft: The Burning Crusade.”

That’s no excuse. Now they’ll be relying on Blizzard’s next release to plump up their revenue, with Wrath of the Lich King, an expansion pack for the World of Warcraft franchise, due later this year. Luckily the merger with Activision is now complete and the new company, Activision Blizzard, will ably take up any perceived slack.

Sales from other Vivendi divisions however, including Sierra Entertainment, Sierra Online and Vivendi Games Mobile, were up from last year, while 2008 second-quarter sales were up 6.7 percent, to $349.2 million.