I think the only problem I have with them is when they come on.
I don't mind commercials, when a show is built to have them. Like on TV, there are specific times the show is supposed to cut to a commercial - it can help build tension and suspense. Or leave you with something to contemplate. (Sometimes.)
The thing with some streaming sites is that commercials come on in timed intervals (e.g. every 10 minutes), and the scenes aren't built like that. So yeah, it interrupts the flow. Sucks, but it's a trade-off for being able to watch shows I can't watch on TV. (Obviously, there are ways around seeing all the ads, blah blah.)
That said. Are you guys actually getting commercials that often? I just checked out a video and the commercial breaks were split every 9 minutes or so.