Small bit here...

The absolute best movies IMHO always had the following bits in common:

* An excellent story to back it all up
* Competent use of lighting
* Good composition in every scene (or at least the vast majority of them)
* a rhythm - that is, the story is carried at a good pace (see also why most of the 2nd book of LOTR was removed from the movie series)
* an avoidance of over-stimulation - that is, you give viewers time to recover in between intense scenes of drama, action, or whatever. It also allows build-up.
* sound (usually present, but IMHO not always necessary) matches pace and mood.
* enough believability (no, not probable, but always in some way/aspect/condition possible) to suspend disbelief, even if only for a little while.

Now the crap, campy movies that I love ever-so-dearly? I love them because they go out of their way to violate as many of these bits as possible, but you always know that up-front, and pretense got thrown out the window long, long before the opening credits. :)

But, okay... look at those bullet points up there again. Notice that gimmicks aren't needed or necessary? Yeah, thought so.

Sometimes, good ideas can be strangled in very short order.

Does anyone else remember the 'Matrix' spin-move thingy? Remember how when you first saw it, it was like "holy shit that was cool!", but as world+dog incorporated it into their own releases, it just looked like crap? 3D is a lot like that. You see it used competently, and are impressed. World+Dog tries to cash in on it, even when it doesn't make sense to do it... and suddenly the technique is crap.

Okay, how about that voice-shifting thingy that was originally used in a Cher (I think?) song a few years back? Now every bit of unadulterated crap that oozes out of the recording industry's festering anus includes voice-shifting, to the point where figuring out lyrics would compare to cracking Project Ultra back in WW2, and any sense of melody got shot in the gut long before the microphones got warmed up. You get to the point where every song with that technique in it grates on the ears. (Note that I'm not a Cher fan, but I thought the voice shift thing was pretty cool).

Point is, there is a bit of danger in over-use, poor use, and using it to cover up crap cinematography (or audio, or whatever).  It happened with 3D back in the 50's and 60's, back when 3D required funny paper glasses with red and blue 'lenses'. It may well happen again.