I really see your point about D&D 4th ed being perfect for video game conversion but I would point out that all the iterations of D&D fit into that category.
I think an accusation that has been leveled at 4th edition a lot is that it is a WoWification of D&D. Having never played either WoW or 4th ed. I don't know if this is a fair statement or even if it really constitutes a criticism even if it is true.
I know this thread has been dormant for a while but I just wanted to link to RPGMP3: Dungeon ON! which has a huge collection of recorded play sessions from a wide selection of different systems, some campaigns have ~80 hours of material.
I also wanted to thank PaulK for mentioning RPoL, I've been having some fun in a few games there.