Terrible (spoilers)
I remember this being bad, but I watched some last night, and it was actually worse than I remembered. This movie cheaply terrible dialogue, 2 dimensional characters, bad acting, and every cliche about musicians you can imagine. Justine Bateman is laughable prancing around the stage with a cowbell. One of the best parts is when she runs away from Liam Neeson on the beach, yelling "YOU'RE LYING!!" And the scene with the near overdose is laugh-out-loud funny -- they beat the girl until she wakes up and then she's fine and off the drugs.
I've seen better film on teeth.