I recently moved back to the US after many years abroad and started using Amazon again, buying around a dozen items w/ Prime.
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1. Most items don't ship for around two weeks.
2. The tracking is all over the place (the delivery windows are mostly incorrect due to #1).
3. The reasons for delays are - from what I can see - totally made up (per my private conversations with the product-maker, or due to localized weather which just doesn't exist).
4. The directionality of the packages en route is illogical (ie, a package is in one state then in another, two minutes later).
5. Their live chat support agents consistently give further incorrect information/explanations regarding the problems I listed above.
6. Not to mention the problems I read from other HNers about fake reviews and knock-off products.