Why Rambo will suck..

First off it has Sly Stone reprising a role that he first stared in 1982. They assume its going to recapture the magic of Rocky Balboa.

Second..the trailer SUCKS!

Third they arent screening this movie for the press which tells us they dont want people talking about how awful it is before its release.

Here is a look at a few other movies that werent screened for the press.

Saw 3(lame)
AVP-R (Travis liked it)
Hills Have Eyes 2(lame)
Get Carter(lame, and another Sly Stone Movie)
Snakes on a Plane(technically a dud, although i kinda enjoyed it)
Crank(worst Jason Stathamn movie ever)
Wickerman(fell asleep during it)
Phat Girlz(you seriously think i watched this?)
you get the idea..

The Studio knows this movie is going to tank(probably) and they are choosing not to screen it for this reason. There is no other reason for this movie not to be screened.