Disagree, they may not be teaching you history or english or how to balance your checkbook but they do train the ability to think, solve problems, plan and process information at a high rate of speed. The military often talks about how the video game generation is better suited to the modern information intensive battlefield because these kids can take multiple streams of information and process them at high rates of speed. The same would apply to anything where lots of information has to be assesed at a high rate of speed.
That's not teaching, it's training. If you want to say repetitive simulated problem solving at high speeds helps train someone to think and act quickly, I'll buy it. It'd be interesting to see the data on that. And also on how transferable that is. But any activity that requires quick thinking, planning and processing would do the same thing.