MV3D is by far one of the best things the Henson company has ever done. First, it was an astonishing technical breakthrough. I gasped as Waldo pointed to just ME, even though I realized he was pointing to everyone else at the same time! I loved the way Jim mixed the regular puppetry with animatronics with a person in a live costume. It was incredible when the Chef pulled out his shotgun and put REAL HOLES in the theater! (Obviously, though, some mechanism is designed to put them back into place for the next show.) On top of all of that, it's just a funny, engaging story, which is most important of all. The aforementioned quote from Statler and Waldorf -- "We won a contest." "Yeah. We lost!" -- is one of my all-time favorite Muppet lines. I also like the part where Rizzo puts on mouse ears and tries to convince people he's Mickey. The film features all of Frank's characters prominently, and even Bean Bunny gets an important part here. It's also the only time Waldo was ever really funny to me. (And notice Digit in the background behind Bunsen and Beaker! What a great combination, though it would have been difficult to pull off on a regular basis, naturally.)
As his last completed project (this is one that he directed), MV3D is a perfect swan song for Jim. It's watched and loved by thousands of people a day, even non-Muppet fans, and I haven't heard anyone who doesn't give it high praise. That's much more fitting than having his final project be JHH or Storyteller, which were ignored by the larger audience. Also, though Muppets Celebrate Jim Henson was technically filmed afterwards, MV3D was released later due to the technology involved, so it's not only Jim's final triumph, it's Richard's final triumph as well.
I do have a photo of myself from outside the theater, 10 years ago, so if anyone's interested I'll try to scan it and post it.