I really enjoyed the first movie. The 2nd and 3rd Rambo movies were typical '80s over-done effects and massive unrealistic carnage (see also Arnie's Commando). In this day and age with action movies depicting more realistic action (albeit still sensational, but they seem to try), I had high hopes for John Rambo. After viewing the trailer, I believe they are pushing the same, unrealistic shlock that comprised the 2nd and 3rd movies, but with the added level of graphic gore that films can get away with nowadays.
That said, I will still try to see it in the theater. After all, it's John freakin' Rambo! First Blood did a lot to spark my interest in survival and survival knives.