“Bull” (*1/2 out of four) was a colorless revenge melodrama set in London in which a reformed criminal named Bull (Neil Maskell) returns home after a 10-year absence and seeks vengeance on all who have wronged him, no matter the odds or consequences. Unexpectedly missing here are Vinnie Jones, Jason Statham, and about 10 gratuitous London bar-brawls; you do get a lot of tough-guy talking and a lot of double-crosses but it’s all very uninvolving and not helped by flat and dreary cinematography and presentation. This unexpectedly won some rave reviews at the London Film Festival but this proves yet again that a lot of critics are full of bull.