It is common sense that haters are 99.9% more likely to write negative reviews about a screenwriting site than satisfied customers who have better things to do with their time, like go off to ponder and execute the notes they received from Stage 32's professionals who actually do read and care about your projects.
The site absolutely does provide a clear path towards getting exposure and professional representation, but sometimes amateur writers tend to have unrealistic expectations and/or a different assessment of their current skill level.