With the addition of GPS, you might imagine Apple Watch is now a credible runner’s watch. Not so fast.

It may have made a big splash with swimmers, but to appeal to runners, there are more issues that Apple needs to address. Like a screen that stays on while you are running, and controls that still work when you get really sweaty.

All hell broke loose last week when Nike relaunched its much loved Nike+ Running app with a new offering called “Nike+ Run Club.” Plagued with bugs, sluggish performance and missing features, this update has infuriated some of Nike’s most loyal users, including me. Nike+ Running used to have an impressive 4.5 star rating on the App Store. Since the update, this has plummeted to just 1.5 stars. And Nike’s Facebook and Twitter accounts are now flooded with gripes.

So what happened? How could a single update turn one of the best iPhone running apps into one of the worst?