All OS's have bugs. iOS 8.0.2 is decent, while some see/experience the bugs more than others. Only way to find out if your experience will be bug ridden or not is to upgrade.
While there is definitely a valid/formal bug list in iOS 8.0.2 not all will experience the bugs, and a lot of people that do, wont know they're truly bugs like others so they claim "that particular bug doesn't happen for them" but it likely does, they just don't know it.