The reason a lot of people are upset about little stutters is because prior to iOS 7, there were NEVER animation stutters in iOS. Everything was perfectly smooth. It was like liquid, 60FPS animations all the time.
Ever since iOS 7 came out there have been animation stutters here and there, and we've been wanting the smoothness of iOS 6 back.
I don't let it ruin my life, but I do miss the smoothness of iOS 6, even now three versions later. Whatever dev at Apple was doing such a great job making the system so smooth clearly left (or lost their talent) when iOS 7 came about.