Very poor
I did not have a problem with the bugs, but thats because I never even watched past the first episode. First off, the screen is very tiny. Second, I could not find a way to change the voices to English. They do have subs, but I prefer the actual English voices. Third. The episode listing is very awkward. They place the first episode of the series on the bottom, which means you need to scroll all the way down. While I do like how quickly they get the episodes viewable, your better off just watching on YouTube, and I will be sceptical about crunchy roll from now on.
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Naruto Shippuden Official - Watch Naruto FREE!, v2.16