These are the same people that think nintendo hasn't made a good game since before windwaker and that capcom doesn't deserve money even though they made a good game that they'll enjoy.
this all sounds familiar to me
I'd love you to explain how it wasn't a full game.
I know you won't, but I'd love to hear you try!
It's not that it's a third of a game really, it's a planned 1/3 of what will ultimately be the final game. This isn't like most good PC games where they release a product, listen to fan feedback and see how the balance works, then make an expansion that fixes issues, adds lots of fun stuff, and makes the gameplay more rich (Warcraft III, Civilization IV, lots of other ones). It was planned from the beginning to be a three parter, which is a non-issue for single player but a big deal for multiplayer.
There's no way you can spin that as a positive, at best it can be a "personally I don't care." There's no upside to the decision except that Bliz probably gets more money in the end.