Is this movie a stand alone? NO. Was there a book number 8 in the Harry Potter series? NO. Was the movie still good?... kinda...
The first action which you see in the film, is an act by the Dark Lord himself. This act sets the feeling for the rest of the movie. You think that Voldemort is a fun loving hippy?... Well, think again! He just wants the elder wand, and doesn't care what dead person he has to take it from! With Harry, Ron, and Hermione, i mean Hermine, i mean Herman... whatever... They are together, and they are looking to get into Gringotts to get a horcrux, which, surprisingly, against all odds... THEY GET!!!... NO WAY!!! And you might ask yourself, how would you leave a bank? Walk out the front door? Walk out the back door? Apporate out of the bank with your awesome wizarding skills?... HELL NO!!!... You ride a friggen DRAGON out of the bank!... and you jump into a lake, and show your nasty, pale, British body to the world. Something else happens in the middle where you zone out, until it comes to the battle of Hogwarts. At this point Harry is doing something, and Ron and Herman are making out the whole time... And the real star comes into place... NEVILL LONGBOTTOM!!!!!! Nevill is a BA, draws a sward out of a hat, kills a deadly snake with it, and if you watch closely, results in the death of VODLY!!!!... So, Nevill saves the day, and everyone loves Harry Potter, and the world seems happy... There is some "19 years later" bit, but dont watch it, because JK Rowling was dumb for writing it anyway. Well that my take on HP-DH2...
Till next movie, watch stuff.