Anyone had issues with iWriter?

First of all thanks to iwriter for giving me a chance to write for their clients. NOW! I'm getting article rejections and very low ratings for no apparent reason. SERIOUSLY, when did it become okay to reject articles because you can. Anyway, I have written for more than two years and for Pitts sake I don't think my writing deserves these ratings!!! Unless they are looking for ways to trim writers.... like very crudely.