So what are you saying? British films are usually crap? I think that this is an inaccurate statement (to put it politely). Like all films, British films has some hi's and lo's, but in general, I consider British film as high quality, as due to the lower budgets than Hollywood, they typically concentrate on plots rather than CGI!!
As for this film, it's actual strength (other than good all round acting), was actually seeing very little of the werewolves (more than likely due to lack of funding to achieve this).