This episode just aired in the UK. I'd already downloaded it and seen it, but after seeing it on the normal-sized screen, I just had to post a review.
I've been a massive Simpsons fan for 7 years and a futurama fan for as long as it's existed, and I've never laughed so hard at any episode of either series ever.
If you say that futurama is in it's prime at the moment, then I think it's fair to say that futurama is a little wacky, especially if you compare it to the simpsons at the same point in it's life (I'm talking about stuff like war being declared just as Fry and Bender sign up, and any scene containing Zapp Branigan). This episode continued the futurama theme perfectly, being spontaneous, hilariously funny and varied.
The storyline of all three main characters joining the army was typical, Leela joining disguised as a man and Zapp still being attracted was valuable, as was all of the ball references. The funniest parts were the humorous doctor, Zapp's 'Surprise!', the winding-up of the guns!, and Bender's top 10 was just classic. I feel it lost some of it's humor in the last third, but still very much an A+++ episode.