It came out awhile ago, but I just recently got it and finished watching the episodes and bonus features. Unlike any other DVD review I've done, I won't bother to review each individual episode this time, but I'll instead list some of season fourteen's highlights, as well as some of the duds.
I can say right away that I was surprised by this season. After season 10-ish, I haven't really enjoyed any of the seasons on DVD... bland stories, weak jokes, and just general mediocrity. For season fourteen though, I was happy to find that I actually LIKED a lot of the episodes.
Before watching any of the episodes, I read a lot of people's reviews complaining that Homer is beyond dumb in this season... that his IQ had dropped 30 points, and that he changed for the worse. While there are gags in some of the episodes that make Homer come off as a complete dummy, most of the time the jokes were still funny to me, so the new Homer didn't bother me this season.
The season as a whole is average or slightly better throughout ... I found myself rating most every episode between 3.5 and a 4.25 rating out of 5. My favorite episodes of the season include "Treehouse of Horror XIII" (Mostly in part to the 'Send in the Clones' bit), "Helter Shelter", "The Dad Who Knew Too Little", "Three Gays of the Condo", and "Dude, Where's My Ranch?". Those five episodes I gave 'season high' 4.25s to. The worst episode, and the only one to get a 3.25 from me, is "Pray Anything". It's just a boring episode with very little to chuckle at. Regardless, the season averages about a 4/5 for me. Even though I wouldn't call a single episode from this season GREAT, I'd willingly watch most of these episodes a second or third time over again.
As for the bonus features, they're like the menus -- based almost entirely around Treehouse of Horror episodes from seasons past. I don't have any issues with this, but I don't understand why they haven't just released a Treehouse of Horror I-XX or XXII box set or something. I assume they'll do it at some point...
The other features include the usual... commentary on every episode, art galleries, and deleted scenes. I haven't and usually don't watch episodes with commentary, so I can't comment on how they are, but apparently Matt Groening isn't in many of the episodes.
Overall, The Simpsons: The Complete Fourteenth season is the best season to me since the tenth. Although nothing about this season will blow you away, you'll more than likely approve of more episodes than you disapprove.