The whole 'keeping film makers in line'-idea could very well be a great benefit of the existence of film critics, but I think you make an integral mistake by thinking it's anything else than a side effect. For a god-like person who rules over our society, this would indeed be the reason of your existence, but for you personally (and for every other film critic), your main goal is nothing more than being an added value for your audience to the magazine/website/other medium you write for. This is done by providing your audience with 2 things:Let me be blunt: If we weren't so jaded, things would almost never get better. That, in the end, is our job - nay, our duty. Movie studios, like all businesses, take the path of least resistance, and they'd be all too happy to take advantage of the average person's inability/disinclination to see everything and just keep giving you the same five movies over and over again. Smug, impossible-to-please know-it-alls like me, frankly, keep them from doing that - perhaps only a little - by sharing our informed opinions with people who might benefit from them.
- Entertainment;
- Useful info about movies. This can be anything from your opinion, which we can compare to ours, to plain info about the movie itself.
If you can fulfill these goals with a main focus on stimulating film makers to enhance the quality and originality of their movies then that's fine. If you can reach both your own, much more 'noble' goal and the goals I mentioned, then that's fine. But just don't forget why wé are here.
Not that that's what you are doing with your movies and articles, and in my opinion your job can still be a challenging, 'intellectual', respectable profession, but I always get itchy when I see people pretend that their job is done for a higher cause. Especially when it's not.