7even (1995)
The production company, New Line Cinema appeared for 5 seconds, this may be in order to promote previous and future productions they did and attract fans to their other works and vice versa.
The producer, Arnold Kopelson, appears for 2 seconds, this may be because he has produced many other films, such as outbreak and the fugitive, and will lend credibility to other films he has produced. In short, he makes his films popular and his films make him popular.
David Filcher is a relatively well known electronic media director and producer (film director, film producer, television director, television producer, and music video director) and, therefore, generally helps fund and direct in the films he works on (Think Steven Speilberg but not famous in the slightest outside of America).
Brad Pitt is a very well known actor and is seen in a significant number of major films such as fight club, troy and inglourious basterds to name a few and therefore has many fans who would watch se7en simply because he is in it and may also encourage people who watch se7en to see his other films.
Morgan Freeman is, like Brad Pitt, a very famous actor and has also been in a fair few major films such as 'the shawshank redemption' and 'the dark knight' and is also likely in it as much for the prestige and attention he will bring the film than his actual acting skills.
The title itself appears for 5 seconds so you know what to search up for future merchandise i.e the DVD, and is made to look like this in order to fit into the macabre, sinister theme of the film.
In conclusion, I think that this is an effective opening because it shows the major talents for an effective amount of time in a font that grabs the audiences attention establishing both the major talent and the general themes and concepts of the movie, in this case a sinister murder/mystery