What does a good ski feel like ?

I’m planning to demo some ski to find a good ski that can help me advance. But I’m worried that I might not be able to appreciate the differences between the different skis. I’m intermediate and trying to improve on groomed slopes. Not interested in anything else. I read a lot of reviews and they talk about forgiveness, playfulness, being good in slow/fast speed, have to push…etc not sure what these feels like. In other words, how can I know that this ski is bad/good for my style and skills?

Edit: Thank you everyone for all these great comments!