...it won't be an R-rated, gritty war film?
http://www.the-fanboy-perspective.com/a-rant-against-modern-tentpole-film-making.html
I don't think it means anything regarding the rating. There have been plenty of R-rated Action Thrillers and plenty of PG-13 ones.
R Action Thrillers
http://www.ranker.com/list/best-r-rated-action-thriller-movies/reference
PG-13 Action Thrillers
http://www.ranker.com/list/best-pg-13-action-thriller-movies/reference
Technically:
Action Films: This major genre type includes films that have tremendous impact, continuous high energy, lots of physical stunts and activity, possibly extended chase scenes, races, rescues, battles, martial arts, mountains and mountaineering, destructive disasters (floods, explosions, natural disasters, fires, etc.), fights, escapes, non-stop motion, spectacular rhythm and pacing, and adventurous heroes - all designed for pure audience escapism with the action sequences at the core of the film.
Action films and adventure films have tremendous cross-over potential as film genres, and road films often overlap with action films. (See the adventure film genre listings for examples of these action/adventure pictures.) Both types of films come in a variety of forms or genre-hybrids: sci-fi or space, thrillers, crime-drama, war, horror, westerns, etc. Oftentimes, action films are great box-office hits, but lack critical appeal because of their two-dimensional heroes or villains.
The main action centers around a male action hero or protagonist - portrayed by these most prominent actors: Bruce Lee, Steven Seagal, Sylvester Stallone, Harrison Ford, Bruce Willis, Chuck Norris, Arnold Schwarzenegger, Douglas Fairbanks Sr., Bruce Lee, Charles Bronson, Steve McQueen, Jean-Paul Belmondo, Chuck Norris, and Jean Claude Van Damme. Women in action-films usually play the roles of accomplices or romantic interests of the hero, although modern action films have featured strong female characters to broaden demographic appeal.
They almost always have a resourceful hero(ine) struggling against incredible odds, life-threatening circumstances, or an evil villain, and/or trapped or chasing each other in various modes of transportation (bus, auto, ship, train, plane, horseback, on foot, etc.), with victory or resolution attained by the end after strenuous physical feats and violence (fist fights, gunplay). Action films have traditionally been aimed at male audiences, ages 13 to the mid-30s in both American and world-wide markets.
Thriller and Suspense Films: These are types of films known to promote intense excitement, suspense, a high level of anticipation, ultra-heightened expectation, uncertainty, anxiety, and nerve-wracking tension. Thriller and suspense films are virtually synonymous and interchangeable categorizations, with similar characteristics and features.
If the genre is to be defined strictly, a genuine thriller is a film that rentlessly pursues a single-minded goal - to provide thrills and keep the audience cliff-hanging at the 'edge of their seats' as the plot builds towards a climax. The tension usually arises when the main character(s) is placed in a menacing situation or mystery, or an escape or dangerous mission from which escape seems impossible. Life itself is threatened, usually because the principal character is unsuspecting or unknowingly involved in a dangerous or potentially deadly situation. Plots of thrillers involve characters which come into conflict with each other or with outside forces - the menace is sometimes abstract or shadowy.
Not necessarily but it's possible.
What's missing in movies is same as in society: a good sense of work ethic and living up to ideals.