It all depends on the rider, type of riding and personal preference. If you ski aggressively (for example charging groomers between runs) then you will quickly find the length too short. If you ever hit big park hits the ski length will provide less speed than something longer and will be less stable landing at such speeds. The plus is that they are slightly easier to spin with. My first park skis (back in 01) were 167 and they were great while I wAs learning. But as I progressed I found myself overpowering the ski. So, keep the above in mind as well as your current skills
I'm 5'9 and ride 180 length park skis and 193 length powder skis. I lovethe challenge of adapting to a ski that is bigger than I'm used too.