I don't have a Roku 3 yet, but I'm currently using Amazon Fire TV and a 3 Mbps PLDT connection. In my experience, the quality depends on the service you're using. For example, I seldom get HD quality on Netflix. I even consider it sub-SD quality, like watching a VCD copy. Hulu, on the other hand, is so much better. The images are crisp and clear, with the quality deteriorating only once in a while. Amazon Prime movies are better than Netflix, so if the movie is available in both, I'd watch it on Amazon Prime.