Your pump may be typical. I just looked at mine. The main filter pump is a Pentair Intelliflo VSF, and it looks very different from your pump. More plastic parts. My water feature pump, though, looks similar to yours. It is a Whisperflo and has rust on the motor around the ventilation not unlike yours. I can't see how it is anchored to the concrete slab (maybe it isn't anchored?), but all the visible nuts and bolts (except for the screw holding that little housing on top) look to be stainless steel. Also the bond wire is a bare wire running from one piece of equipment to the next, and then looks to go underground. This equipment has been in place just under a year. Looking closely at our two Pentair pumps, I see that painted steel parts don't exactly match the colored plastic parts, and the various plastic parts don't exactly match one another. I've seen a lot of things made of plastic and steel, including yard and garden stuff and even computers and computer printers--and I'm not put off by unmatched colors.
Our southeast Texas climate is, I'm sure, similar to yours. The state bird is the Mockingbird, but frankly, it should be the mosquito. Where I live just west of Houston was once all rice paddies and oil wells. Just east of here, and all the way to the Louisiana state line, the Mississippi River and beyond, was coastal marsh (Mark Twain described Houston as "only fit for mosquitos and Methodists.") 90/90 (temp/relative humidity) is not unheard of here. Bottom line from my limited perspective is that your rusted washers should have been stainless steel, but otherwise, the appearance of your pump is probably normal for environments such as ours. I've attached a picture of my Whisperflo.