*Disclaimer: I am not a professional movie critic, I'm just a regular viewer or an audience per se*
First of all: I recommend to watch this movie without watching the trailer or at least not to read the reviews for you to appreciate the movie (at least that's my own opinion and what I've felt, when I watch this movie). If you're not into a "Drama" genre, you probably wouldn't appreciate the movie. Even I will not even recommend this, if I'm not that into/interested with it. But it did changed my perspective, because not all "drama's" involves with crying, etc. Rather, It involves with how well the story was created/written and how those characters would interact towards each other and how they will be carried along with the story (It's like you're watching a movie/reading the story all at the same time. If you know what I mean). But if you are curious about the movie, there's no harm also to try to watch the film. ^_^
Personal Remark: Once again Bradley Cooper has proven to us, how an adroit person he is. Yup, I used "person" because not only he did the acting stuff in the movie, but he's the director of the movie as well. Not only that, you will also notice how he took care of Lady Gaga, which also showcase's her performance as an actress, as the story progresses (Sure, there's a glitch of her acting here and then, but you must still give her the credit that she did a superb job on delivering her character in the entirety of the film.) As for the story, I love it, I really felt how Bradley Cooper dug deep with it and not just making this movie for the sake of making it. The slow phased of it, makes you immersed with the vibe of the story or he made sure that, it makes the audience feel connected with the characters involved (At least that's how I've perceived it). In addition, I love how Lady Gaga and Bradley brainstormed on how they will present the real side of a musician's life story. You can tell that some part of it was from Lady Gaga's life story as well (or at least that's what I've felt). The soundtrack of the movie makes your heart melt (plus, other factors as well ^_^). Once again, Lady Gaga evinced us how multifaceted artist she is.
Overall: I will give this hard rocking movie a fun 4.7/5 stars. I hope you enjoy the movie.