I added mummybox, nowheretv and justintv. Is there any reason why these aren't very clear? Or is that just how they are?
Dunno about mummybox.
NowhereTV mainly uses iPhone feeds, so a lot of them are very low quality. And as far as I can tell, JustinTV exists only to show someone's low-quality feed of TV shows that they shouldn't be showing to the world, as well as webcams without nudity and people playing video games.
The real quality channels on Roku are the ones you pay for - Netflix, Hulu+, Amazon, and the sports channels. Most of the rest are very niche, or very low quality.
Oh that's not entirely true. There are a bunch of really high quality free channels, lots of junk too. It's tedious going through them but don't let the pay barrier be your guide. Off the top of my head, because I use them: Bloomberg, iTunes Podcast, MSNBC, TED, Fox Business, WSJ, CNBC,ONN, Pandora, byutv, Crackle, BBC World Service, & a bunch of others are all outstanding.