The storyline wasn't bad. It basically stayed on track and provided lots of Jiro lovin. =3
Each character developed and the scenarios they were put into were well-plotted.
I was a little annoyed by the montages dedicated to their memories that became more prevalent toward the end of the series, and the segment showing MARS getting famous again was a bit boring, but it was good opportunity to recognize real-life events. I enjoyed the subtle references to things like Fahrenheit MVs and the X-Family.
I really liked the music in the drama, especially the song MARS performed for Momo called "Chu Kou." I'm really into catchy punk rock so I was super sad it wasn't on the OST.
I was also fairly impressed with the characters. Rainie Yang played the agoraphobic and socially awkward Momo very well. Jiro played MARS, the hot-headed superstar very convincingly. I feel he could really relate to the character, having had similar experiences to those of MARS. The ditzy but well-meaning sister was fun, too. But Jia Sen has got to be my favorite character. Despite being both super hott and manly

he's still got the naive charm that comes with his childlike demeanor. George Hu = lovelovelove <3
My biggest problem is that I didn't really sense chemistry between the leads the way I did for Joe and Ariel, Chun and Ella, or Mike and Rainie. Because of that, it didn't seem as believable. It just enforced the fact that the show wasn't very realistic, something that most people wouldn't encounter. This wasn't exactly bad, merely reminding me that I need to focus less on fictional worlds like these and get a life of my own. XD
Overall, it's a cute show that's at least worth a watch. I was really into it and sped through it in about four days.
I'd definitely recommend this if you're a fan of any of the main characters, especially Jiro.