Don't Bother Renting Movies on Steam

[Mike Andronico]

Steam now offers dozens of blockbuster film rentals, but the service can't even come close to the convenience of Amazon Video or Netflix.

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[jakjawagon]

Not only can you not watch them on anything other than a PC, but there is a huge discrepancy between the available films in different regions. The US gets 70, largely filler but a few good ones. Here in the UK we get 11, and they're all from the bottom of the barrel.
Gaben himself has said that regional lockouts and lack of control like this is exactly why some people choose to pirate.