Recent Steam Update Breaks Modern Warfare 2 Multiplayer

We've been collecting several reports from the official Steam forums, according to the reports, a latest Steam update made every game mode in Modern Warfare 2 apart from Team Death Match unplayable.
We've been collecting several reports from the official Steam forums, according to the reports, a latest Steam update made every game mode in Modern Warfare 2 apart from Team Death Match unplayable.

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What is going on? The update installed MWIII multiplayer even though I don't own it, and deleted my MWII multiplayer completely? I don't think I've ever been actively discouraged by any studio

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