All the Type-Moon fans are raging because apparently they're not animating the Heaven's Feel route. I'm happy for the sequel (haven't played the VN) but almost everyone else on other forums are raging about how it's not a true sequel and all that.
Personally I couldn't give two fucks. Fate Stay/Night isn't a series I really care about the story for.
Heaven's Feel is more popular, but entertainment is more important.