Eddie House has always been a very streaky shooter throughout his NBA career. I'm very surprised by the fact that people are surprised by his production so far.
Besides, he's not really a great pure shooter, far from it. For example, getting open looks is not important at all to House. House has 4 great advantages: he can handle the ball, he's very comfortable coming off the bench, he's extremely fast releasing the ball (that causes his shooting efficiency to oscillate very little no matter the level of contentedness of the shot), when he's hot and gets on a rhythm he's really dangerous and extremely difficult to stop, even if you put your best defender on him.
But a consistent great shooter, able to knock down open 3 after open 3 (like Peja, Dell Curry or Paxson), he isn't and he never was.