Line Arrays are a bit overused in general. They have their place but rarely in cinema. I firmly feel that the suspension of disbelief depends on point sources coming from behind the screen and Line Arrays don’t to that well.
I also believe that the sound should be reflective of the seated position. That is, if you sit in the rear of the theatre off to the far corner…then not only will your picture be smaller (perception) and skewed…so should the sound be to match that. It shouldn’t sound too big…and I’ve heard that.
The only time I could see using a loa array in a cinema is if the venue is SO big that one has to admit they are going to fail at presenting the sound in any semblance of proper anyway and is thus playing a came of compromises.
Read more: http://amthanhthudo.com/loa-line-array