Yep, which is why I hardly ever use it. I've enjoyed commercial-free Netflix programming since we dumped cable over a year ago.
Yes Hulu has commercials, about half as many as the regular broadcast, but it also has programs that were on yesterday not just last year. I watch movies from netflix but TV shows from Hulu there is also crackle a free service like Netflix but a smaller selection of content that changes each month.
I tried Hulu and Crackle. Both insert commercials.
The problem I found when viewing with ROKU or WD TV was that Hulu and Crackle would lock up after the commercial and not return to the movie/tv program. If I tried to restart and advance the video to the prior location, it would glitch out and show several commercials.
Hulu and Crackle turned out to be more trouble than they were worth.