The following is excerpted from my Paranormal Activity review… it’s a portion of the post that I find myself referring to and wanted the passage in its own post for reference.
THE LIMITATIONS OF AUTO-CHRONICLING
The “auto-chronicled narrative conceit” has its innate issues. It creates a single camera situation shooting in real time (Blair Witch circumvented this by having two cameras available, but didn’t really leverage it), with one character nearly always off screen, that does away with (or severely hampers) all the established film vocabulary tools… the wides, the two-shots, the over-the-shoulders, the singles, the cutaways, the inserts. All the film tricks that directors and editors use to subconsciously establish relationships between characters, to control tension and mood in dialogue exchanges, to communicate unspoken subtext, to control and structure our experience of the story into a narrative that works, are suddenly wildly restricted if not impossible to leverage. […]