Good, but the raving slightly kills your piece.
Great animation, first off. Your plot is great too. When this first starts out it's really funny. Then once your executive character goes ape shit... the humor fades. At first the rants are funny then it just kinda gets a little dumb. Random but the humor starts to fade. One huge reason, and correct me if I'm wrong, but once the ranting starts you can really tell that it is you doing both voices and that's when it sounds like one guy just kind of randomly going nuts. Maybe not for all but for some this dimmies down you attempt at funny. And I don't mean this comment to sound like I'm being a picky bastard. I'm just giving a constructive critique. I feel you should have gotten another person to do the assistants voice and let the dialogue of the executive be less far fetched. I mean keep some violence in though. Have him break some random stuff even. Maybe even add some Denis Leary like quips.
Besides this, I did enjoy this. Your plot was great, as I said. Maybe your opinion isn't for some about those commercials but it still brings up a good point and a great way to bust right into your humor. Plus, how you did the end like it was another commercial was a nice touch. Overall, Great animation, interesting plot. Though the humor maybe less to be desired it does bring the point around and still make this worth you watching time.