It's probably one of the best.

Rating: 9/10 (2 October 2013)

To start off with, when I say this review may contain spoilers, I'm not kidding. It's what makes the film great, I'm talking about it for a quarter of this short review. So be warned! I admit that the actors did well, but it's the spoilers that make this movie. Here we go!
This introduces us to a new age of Harry Potter. Harry himself looks older, angrier and sadder (which can happen with age) along with Ron looking even more terrified than usual with his new look. Draco's stopped slicking back his hair, Hermione's getting older too, and Dumbledore's had a complete makeover (mainly because he's being played by Michael Gambon now.) So now we've got the new out of the way, let's see what's returned from the old films.
There are still wizards, Hogwarts is still visually stunning, Hermione's still taking far too many classes and being far too clever, Ron's still got his pet rat and Harry's still trying to be killed. So far so good... but wait! What's this? Ron's pet rat is actually a man? Hermione's got a time travel device to get to classes? The murderer on the loose isn't actually a murderer, doesn't want to kill Harry and is his godfather? Played by Gary Oldman? This film certainly changes things up.
It's not going crazy on the special effects like later films will, but still has that certain charm about it. It's just what makes a great film because the effects are subtle and not in-your-face. There's also some action involved - Malfoy finally gets punched after three years! It's great to see another one of the three finally making a difference (we're still waiting on Ron doing something other than being terrified of spiders, but hey, it's a start!)
Finally, the way the time travel sequence is shown gives you a feeling of just what the Harry Potter films should be like - subtle, but impressive looking back on it. It's what pushes my rating of this film up to a 9. Oh, and Hagrid's here too. That's always a cause for celebration. So what are you waiting for? Buy it, rent it, do anything you can right now to just watch it?