Shunned and rejected in favor of better options in Standard play, it could be considered a true blessing that Zangoose set his sights lower and plunged into the unsettled waters of the UU tier. Sadly for the demon furball, however, he has failed to make any sort of impact in even this lower metagame and is still ousted from teams in favor of bulkier, faster, or harder-hitting alternatives.
However, let us not be too hasty in condemning the white wonder to disuse. Though his stats are low, they are distributed excellently; he has a very reliable STAB to use and a collection of moves that back it up with both excellent coverage and desirable boosts. He can run many different movesets, all of which work excellently with a little thought. That said, he is hard to use correctly, but with adequate support, there is very little in UU who can stop him from doing what he was designed to do: cause a lot of damage.