I would agree with you, if the age rating seemed in any way meaningful.
I was playing a video game... would happily let the kids watch as i played. I thought theyd love this playing it themselves, it would be a blast, very dungeons and dragons role play, its a bit dodgy at times but nothing massively concerning for a pre-teen and early teen.
It's an 18.
I absolutely couldn't believe it when i realised. I was right, the kids love it. But an 18 i just don't get.
Even some of the more morally controversial elements, if you playing a game like lego city undercover, rated a 7 you'll find many similar gameplay elements just in cartoon form....
nick a car and go on a murderous killing spree... yep you can do that in lego city in a age 7 rated game.
Disney infinity, kill a load of people, yep but its ok cos these are the bad guys.... just think about that for a second....
It may be (marginally) less graphic but thats still what you are doing.
In the end if your child has a good grip of whats real and whats not, the benefits to their bilateral coordination, general coordination forward planning skills probably outweigh the downsides. I certainly couldnt persude my kids to do the level of OT and physio to get the kind of benefits ive seen from playing computer games. If i started to see any negative impact (temper esp) id be stepping in quick.
Id rather judge for myself than rely on fairly ambiguous age ratings