Each version of the OS has it's characteristics, crashing of Apps in iOS 7 is not unusual nor a sign of a buggy OS. It is what it is, plus Apple tends to choose creating new operating systems rather than refining them.
If you're stuck with iOS 7, the good news is Apple will be promoting iOS 8 before long anyway. Good or bad at least it'll be different. Nothing stays the same.
If you're stuck with iOS 7, the good news is Apple will be promoting iOS 8 before long anyway. Good or bad at least it'll be different. Nothing stays the same.