First of all, let me make it absolutely clear that Voldemort: Origins of the Heir is by all means a short film. With that in mind, it really shows how much dedicated fans can accomplish with a 15,000 euro budget and a runtime of less than an hour - with no motivation other than their love for the series.
The result is a minimalistic, dialogue-heavy film full of references to characters and events from the official Harry Potter movies/books. The inconsistencies are either too small or too few to matter, though hardcore fans might notice. It is essentially a small backstory made into a film. As such, it will probably appeal to longtime fans, but at the same time leave them wanting more, due to the film's short length.
The production values are surprisingly good for being a fan film. The special effects are nice and full of eye candy, certain sequences are really well edited, and the portrayal of Tom Riddle stands out.
It is a polished film with some memorable lines here and there. They really could have messed up on this one - and they didn't. If you are a fan of the Harry Potter series, go give it a watch. It's free (due to the non-commercial nature of the film), it doesn't stray too much from the canon, and, after all, it only lasts an hour.