I just noticed while watching Jaded that it is much more fun to watch people who have no idea about some of the Mod-Mechanics. If you watch Direwolf you often notice that he has no idea about how vanilla-MC works, but he knows a lot about mods, which reduces the amount of hilarious moments (well since he derps sometimes it is still funny).
If you watch people playing minecraft you want to be entertained and if everything works perfectly fine that's not entertaining. You might want to do this to increase your knowledge but not for pure fun.
It is interesting to watch people learn new stuff. And well Jaded already performs very well and I don't think that these guys need very long to get used to the mods. But I think streaming such things is much more fun since it allows interactions with your viewers. Although most of them (including me) try to be helpfull, but it is sometimes a bit hard (like figuring out where the creeper spawned yesterday... I still think he spawned on the upper row of barrels^^) and it often happens that when she asks if she should do this or that half of the stream choose option 1 and the other half option 2 which is not really helpfull^^.
I always remember when I started with Redpower and felt like "WTF how does this shit work?". And if you are new to the whole FTB-thingy and most of the mods... just try it out before reading lots of guides and such, learning by doing is much more fun.