No its not, that review is overly harsh for some reason, if you look at the gsmarena review he says its quite good.
http://www.gsmarena.com/oneplus_one-review-1101p8.php
"Overall, the OnePlus One produces very good images. The 13 MP resolution is high enough and the detail level leaves almost nothing to be desired. There is a little bit of noise but that's the consequence of the relatively small sensor and high resolution. We definitely like the laid back approach to processing that OnePlus has implemented as well."
Phonearena:
http://www.phonearena.com/reviews/OnePlus-One-Review_id3758/page/3
"Not the very best, but definitely up there. The UI is clean-looking, and, with some exceptions, easy to navigate."