Depends on who the streamer is. Some may be good players but for some reason do dumb things when streaming. Or, they make the right play that fails and they don't explain why they did what they did. In their defence, there's not a lot of time available to explain, so they'd have to be really good players and really good commentators.
If you can find one who seems to be a strong player and who you think you can learn from, then yes, absolutely!