No please don’t Netflix the Amazon reviews. There is a huge advantage in granularity. Everything in life isn’t so binary, where you either loved or hated it. There is so much gray area in between that makes ratings useful. Netflix neutered their whole rating system when they introduced the thumbs up and down system.
There are lots of weird things that happen in reviews (from real people). I've often come across three-star reviews which say:
"Product was awesome, but shipping took three days, not one".
There are other reviews I've found useful, for example ones that point out minor flaws. That ability would be lost if you had a simple "good/bad" reaction only.
Should just be thumbs up, thumbs down. Maybe a "meh" in between.
Alternatively, ask for ratings as 5 star, treat 4 as a meh, and anything 3 or below as a thumbs down.