Her acting is indeed really annoying.
She was fierce in BoY. Here she is just a parody of herself. It is quite embarrassing.
The PV itself doesn't look bad but it is boring. I'm afraid we already saw the whole thing and the full version won't be any better. It's not something I want to watch twice.
I'm not fond of the song either. It doesn't do anything to me. I might end up liking it or just listening to it because it is part of the album.
edit: sidenote, I'm really fed up with her bangs