You'll be fine riding them in the park. Now granted they won't perform as well as a "park" ski but most skis now days are pretty versatile when it comes to where you wanna ride them. So you'd be fine riding them in the park. But if you spend a good amount of time in the park it's worth investing in a pair of park skis.
Have you tried skiing a similarly wide ski in the park? You probably should before committing rather than taking other people's opinions on whether you'll like it.
I know some people who love fat skis in the park but I don't like it, much prefer narrower park skis.