I personally don't like the look of fake/long nails on myself, but if you want them I'm not going to stop you or say anything about them.
The only time it's weird/gross is when your fingernails are longer than your finger. Okay, isn't that just impractical?
It depends on the length of the acrylic nails.
It can be impractical if you have them very long but I only have my nails a bit longer then my actual nail. If that makes sense.