How can people rate games without even playing it?

[espio100]

I mean, I was looking at twitter and both IGN and GameSpot gave MGS V Phantom Pain a 10/10.
The game isn't even released yet, how can they rate it?

[Ad Bot]

[Xphifre]

They base their review on the screenshots, or they have played unreleased versions of the game?

[Satan From Wreck-It-Ralph]

press copies

[MoltenKitten]

They hae played it in the form of

press copies

[Obliviongate20]

press copies

also could be called review copies(?)

[Slab Bulkhead]

press/review copies

[espio100]

press copies

Oh really?
Alrighty I guess