How come Killzone 2 has already 39 reviews?(Metacritic 93)

[Simulacrum]

Its pretty funny,its releasi is 25th day, and today is 5th day.Still there is already so many reviews!

Compared to other games,like Street Fighter 4 there is only few reviews tho it is released earlier.

Do they review some preview game or game that comes to sale?

Is it good or bad for games sales for it to already have so many reviews,since you might know too much and it won't make such impact?

Killzone 2

6.3 based on 39 reviews Read critic reviews How did we calculate this? based on 79 votes Read user comments Rate this game