I see it as investors being upset at the less than stellar product they put their money into. For some of us (raises hand), I've bought all 3 games, comic books, book books, action figures, limited edition lithographs, DLC, the works. I've invested in BioWare's continued future. Roughly 200+ dollars for the games alone, on top of the merch, with money I literally bled for (really, I gave blood to make sure I had enough money to afford to preorder a copy of ME3), waited patiently for, invested every nickle and dime to my name for some of these items, in the hopes that I'd see all of this pay off when the series ended.
So imagine my surprise when I basically get this big middle finger "F You" ending. As an investor in BioWare's products, in the games, the books, etc, how do you think I should feel? Happy that it's all said and done, even though I don't think the final product lives up to previous examples, nor does it for a lot of other people?
I mean, for example, what if you go out and buy the new Five Finger Death Punch CD expecting to have your ears bleed from all the near-death metal extravaganza only to pop it in and hear them singing Gospel tunes? You'd be upset correct? That's what a lot of people are right now. Because they invested in BioWare's products, in its continued success, in its very existence as a developer.
So when they give me shoddy work and expect me to like it, forgive me if I don't feel just a little entitled to say "No."