This movie tells an amusing if somewhat muddled story, and the acting really is pretty bad -- compared to the usual slick Hollywood stuff. But let's face it, lesbian-oriented films seem to range from low-mediocre to atrocious, so put in the context of the existing art, April's Shower starts to seem a lot better than low-end.
I don't think there was a single polished actor in the bunch. They all over-dramatized or used fakey facial expressions or just plain got things wrong at times.
There were so many relationship twists and flip-flop couplings/decouplings of lesbians and heteros and bisexuals alike that I found myself a bit confused at the end, but I did have fun watching all the mating dances unfold. Be prepared for some plot turns that seem precipitous; either the author left out bits of bridging text here and there or too many scenes ended up on the cutting room floor.
If you want to watch this one, try a little experiment: Pretend you are at an amateur production of a play, perhaps put on by your local junior college. It does make the performances feel a lot more plausible.