Before I begin, I'd like to state that: no, I can't offer a review of the DVD, but you can expect the usual behind-the-scenes featurettes, commentaries, trivia, and interviews with cast & crew, as were present on the DVDs of the first two seasons.
Like many have already said, this third season of the hit sci-fi drama eclipses both the first and second seasons by a country mile. The producers have wisely taken note of past criticisms, and acted upon them. The standalone episodes always seemed to slow things down in the past. Now they've been restructured, in the vein of 'White Tulip', so that each self-contained episode adds a little something to the mythology and/or the overall narrative. Every episode has a part to play, whilst still allowing people to jump into the show with no prior knowledge whatsoever. It's accessible to newcomers, but rewarding for the long-term addicted Fringey.
Fringe is also a show that remembers its mythology and frequently connects with it, whether through subtle things like little visual cues, or through snippets of dialogue, or the stories themselves. It's great, and it makes you want to rewatch the entire backlog of episodes again, to see what and how much you missed the first time round. The producers have categorically stated that clues for future seasons have been planted as far back as the first few episodes, so you can understand how some become obsessed with discovering said hints.
It's hard to really pick out any 'bad' episodes from the third season. Certainly some were slower than others, but gladly the majority have been Fringe at its usual best. A few of my own favourites include 'Lysergic Acid Diethylamide', 'Entrada', 'The Firefly' (nice reference there), 'Olivia', and 'Subject 13', but, like any fan will tell you, it's hard to pick one definitive favourite or one genuinely 'bad' episode.
Onto the show itself: well, what can I say that hasn't already been said? It's intelligent, witty, freaky, twisted, and exciting. 'Fringe', among others, represents a revival of great, modern science-fiction, and shows just how popular this much-maligned genre can be when handled correctly and delicately. It's a shame, then, that this show does indeed live up to its name when it comes to ratings. To say it has millions of fans is an understatement, but it's a show that doesn't get nearly enough recognition, and for a long time its fourth-series-renewal/cancellation was up in the air. There are still concerns over whether it will survive to a fifth season, as Fox tends to have a habit of ruthlessly cancelling fans' favourites.
It isn't often that a TV show can keep me constantly entertained, thinking, amused, baffled and intrigued from one week to another. With each episode Fringe alters your expectations and delivers on them, whilst opening up whole new avenues of thought and raising dozens of questions to keep you hooked. I used the term 'mind-blowing' in the title of this review because it is exactly that - it's a show that forces you to think and to use your head, and shows that do this are not something that are in great supply at the moment. I also use the term 'mind-blowing' because Fringe regularly flips what you know upside-down and shows you things from different angles, and this is part of why the show works so well. It keeps things interesting, and fresh, but above all it means Fringe is always unpredictable. That's part of the fun.
Updated 09/05/11: With the finale just aired, all I can say is that this third season of Fringe is some of the most phenomenal TV I've ever seen. It takes ideas from the first two seasons, and explores them with more depth and precision, often ending up in some dark and twisted places, not enough to make you uncomfortable but just enough to thrill and excite.
I'm not going to actually talk about the finale, because that would be giving away a heck of a lot, but it might make you see the show in a different light, and it may prove to be very divisive if the writers cannot adequately explain it away next season. They've certainly got their work cut out. It's bold, brave, wildly entertaining, and it's guaranteed to make you want Season 4 as soon as you've seen it.
If you're a fan, you're already going to buy this. If you aren't, I hope I've sparked your interest. Thank you for your time, and we'll see you on the Other Side ;)