I agree. Age of the game shouldn't really be a question though as it's still being sold by both vendors and Blizzard themselves. As such, they must provide the service they're selling. They want the control of the realms and the servers, that makes it their responsibility to ensure service.
For awhile now I've been seeing this lag getting worse and worse. The last couple of days, USEast has almost been to the point of being completely unusable. Regardless of what the reason actually is, Blizzard needs to do something about it.