This. You must remember that a company only has control over how quickly they sort your order, compile the package, and sent it out to be shipped.
Once that happens, it is all up the UPS/USPS/etc workers on what happens next. When you gravitate toward the higher-end shipping options, packages go to sorting facilities that are smaller and thus get mailed out faster, and in some cases will travel via faster vehicles. When you use standard shipping, as most people do, it goes to one large sorting facility where the mail workers, at no "minimal" speed set, have to place it in the proper section so that it arrives at your address. This process funnels down as it gets closer and closer to where you live, until it eventually gets into your mailbox.
I guess you just need to be a little patient is all, though your point of view is understandable as a consumer.