The original Green St didn't need a sequel but we got one all the same and to be fair STAND YOUR GROUND was watchable down to the fact it was unintentionally funny . After all it's not every day you watch a film entirely filmed in an American prison trying to convince its audience that it's set in Britain . To be fair this follow is probably mindful of this hence we get constant establishing shots showing us we are indeed in a cold and cloudy London . This unfortunately is the only thing the film manages to achieve
NEVER BACK DOWN is a cynical exercise in marketing a film as a sequel to another film it has absolutely no connection with . There's no reason what so ever for the words " Green " " Street " or 3 to prefix NEVER BACK DOWN and in reality could easily be a star vehicle for Jean Claude Van Damme since it revolves around martial arts rather than unsophisticated fists and boots
The need to showcase martial arts is what the film concentrates on and as other people have pointed out explanation and exposition is sacrificed to show the protagonists fighting skill . From the outset we get a dialogue free sequence that ends with a couple of heavies getting a good slapping . We also get a long sequence of ramping , ie constant fast motion followed by slow motion most famously seen in 300 . In short it's a film of style over substance that won't appeal to anyone who is after a dramatic movie