The Netflix app on Apple TV is the absolute worst. But if you have a lot of iTunes content, there's not much else you can do until Apple finally gets off their butts and releases the new hardware.
To each their own. I prefer the Apple TV version better than any other. The layout just makes much more sense to me. The only thing I don't care for is that it can take up to like 5 clicks to start a video once get into the series, episode, then click play, then click "resume or start over". But that is a minor inconvenience compared to the messy interfaces on other devices.