Unfortunately, there are aspects of this film that have the 'middle' movie feel, but regardless of that fact it is still a movie worth going to see. Unlike some of the previous films, there is some enhanced features such as some better developed dialoge to explain the Harry Potter world. Visually wonderful as well. Can't wait for the next one to see more action.
So, yes, the movie does leave things a bit open for the final two installations of the series, but what can you do? It is nonetheless a very good flick and I am happy that they tried to incoporate as much story as they could before the series ends with a big bang--hopefully. Graphics are also quite nice so I wish I was able to see an IMAX version, but I'll wait till the next two films to do that since there will be a lot more action.