I have to agree , if you are not happy with the dishwasher, take it back. Not clear on where the problem lies here though, water, machine or detergent.
I've had a number of GEs over the years, when the last one died after 7 years I decided I'd go for a Whirlpool, special ordered it for Sears, and hatred it from the second I turned it on. I tried to like it, but just could not get myself to. Hated it so much I took a $50 loss on getting rid of it.
Got a upper mid range GE and have not looked back. Looked hard for a plastic tub model with all the features I wanted, HATE stainless interiors, and this model delivers. Love this machine, it does a great job, just toss the dishes in, never pre rinse, and turn it on. Lots of options if I want them but it's extremely rare to get a dirty dish out of the unit.
P.S. stocked up on Cascade with phosphates, going to GFS to see what they have to offer too.