Even then, the singing is pretty good and respect for all the cast to put out a great show!
I don't know why people are cribbing about the acting! It is supposed to be a parody! The acting is just alright for a parody and the film is funny at places.
The song and dance sequences are very well done and decently glitzy and fun so that you can enjoy it if you are in a theater with good sound.
I love most of the songs featured so I had a blast. If you love 80's rock music and are not too stuck up on the "quality" of singing - then you will really enjoy this movie.
Even for a parody, I was amazed at how sincerely all the actors played their parts - which makes it a very endearing film for me.