Loved it. I was impressed by how long Graham's bit went on. I mean, he had a good number of images, and even some minor animation and such, so, technically, it was pretty great. I'm used to Graham's voice, so I found his altered voice hilarious (and a joke in and of itself), as well as all the many, many, many digs at Yahtzee. Really, Graham's bit was only that funny if you've watched all the ZP vids multiple times, but, well, most people here have, and if they haven't, WHY THE HELL NOT?
As for Yahtzee's review, I loved his diatribe at the end, but the rest of it was usual Yahtzee fare - humorous and a highlight of Wednesday's, but not Earth-shattering. Really, I don't think Yahtzee will ever manage to be as hilarious as he was in the Prince of Persia Retrospective, but his stuff is pretty much always good.
I was disappointed that Graham made no slights at Yahtzee's mum, but, hey. Also, loved the Imp's bit at the end. Also also, the second or so image in the credit sequence where the imp tackles Yahtzee from behind NEEDS to be Rule 34'd.
I can't think of too much else - Graham obviously put a lot of work into making his 2 minute review (ZP knock-offs are very time-consuming to make, and he's got a comedy website, a video series on the Escapist, and a job), whenever Yahtzee yells it's pretty much guaranteed to be hilarious, and a nice show of support for Unskippable during the credits.