A 24fps frame rate should be easily visible when things are moving quickly, but the frames should be evenly spaced. Are you saying that the frames are not evenly spaced?
To get good 24fps video without the frame rate being obvious you need to restrict the shutter speed to a maximum of 1/48th second which probably involves using neutral density filters in daylight, you can get good 24fps video from the Git2 but good 60fps 1080 is considerably easier 😉