I often have trouble watching many FPS games much less playing them. Been using iOS7 since the early betas and I never even considered any of this an issue, nor did any of my coworkers many of whom upgraded early as well. The parallax view is a pretty pointless trick. I wonder how much of this is real and how much is suggested by all the articles? It's hard to imagine that a real problem wouldn't have been seen by people at Apple and all the developers who like me have used it for months. It's strange to think a small device's virtual motion could cause that much reaction.

Perhaps these people are looking at it wrong?

As someone mentioned elsewhere, what affects someone is going to vary from person to person. I've been lucky that iOS 7 hasn't bother me, considering I am the type of person who can't read in a moving vehicle.

Same for me. I get sick travelling and playing video games but I've been using iOS 7 since June and never had a problem.