Product review (5 stars): CLEAN THE CRUD
2 things i found about this dishwasher, you need to twist the holding mechanism and remove the spray bar for the top rack and clean the dirt out of the spray bar bearing seats otherwise the spray bar won't turn freely. Water pressure has no bearing on how this spray bar turns as the pressure is made from the internal pump and not from city water pressure.

the bottom spray bar can be removed just by pulling up on it and then you can clean the bearing surface easily.

try turning the spray bars, if they are hard to turn you got dirt in the bearings.

periodically while washing open the washer and pour in a cup of bleach, it will keep the mold from growing in the spray bars also.

mine works well, but I do clean the spraybar bearing surfaces about every month.

also there is a large filter in the bottom to keep glass and hard things out of the pump, this needs to be cleaned every month
by unscrewing the large plastic housing and lifting the whole screen and filter out of the bottom of the unit. the filter comes out of the housing and can be washed in the sink. if this is not done you might get a stinky washer and a bad drain cycle leaving your dishes dirty.