Sorry for not recognizing that you were playing devil's advocate, I'm a bit thick in that regard.
Animal Farm's message is broader than I think you realize, or maybe you do. It annoys me to see the book disregarded as setting the foundation of 1984, like some kind of first draft, when really, its a whole separate masterpiece. It's not only a criticism of Stalin, it criticizes revolutions in general. See, many revolutions (excepting the American and others) throughout history tend to have the same effect; you end up with a leader even more absolutist than the one who preceded. Yes, this was the case with Stalin, but what about the French Revolution? That's right, a mere decade after the end of it, Napoleon declared himself dictator (hence the pig was named Napoleon, for he served the role of the leader who becomes tyrannical shortly after the country is "revolutionized").
Look at the first few paragraphs of this:
Where have all the revolutions gone? - International Herald Tribune
You could even draw a parallel between Animal Farm, and Gabriel Garcia Marquez's 100 Years of Solitude (great book). Though it is of a completely different style and genre, it emphasize's humanity's inability to avoid repetitive history and suggests that time does not go in a straight line but a full circle.
And yes, I refer to 1984 all the time as well. For instance, when people talk about government corruption, I compulsively say something like "Yeah, just like in 1984, where the Ministry of Love is in charge of torture!" I love the delicious irony, and the book is rife with blatant examples; War is Peace, etc. What's worse is that when Winston goes in-depth about describing the three rules, and how war is peace because you have a common enemy and it unites you, I actually started to believe it, for it makes sense in its own warped way.