This was one weird movie. Two things kept it afloat. First is the commentary on society's dependence/love of their technological gadgets. As silly or crazy as this movie seemed at times, you had to think to yourself how connected you are in today's world to your device/devices. His reaction at one point when he thinks it's broken and "she" is gone is so spot on to how people react when their phone is broken. The other thing is that Joaquin Phoenix just goes so all in with all his movies. As quirky and weird as the whole thing was - he kept you interested because of how deep his portrayal of this role was.
I would somewhat recommend this movie to people. I wouldn't agree with the critics putting this at the top of the year lists and what not. Great acting by Phoenix but not a must see movie by any means.