Some of the clips show really great performers; Benjamin Bagby comes to mind. He knows how to work an audience like a bard. Eberhard Kummer's performance of the "Nibelungenlied" sounds great (and the dancing is very nifty) but he's looking too much at his instrument to connect to the audience in the way that SCA bards usually seek to do. Ron Cook's harp-and-storytelling is in one of the probable historical performance modes (instrument and voice, just not at the same time) and I don't find it as compelling.
Your Mileage May Vary. What I really like about this site is that you can poke around on it until you find a performance that you really like, or don't like, or almost like. Then you can copy it, avoid that style, or adapt and tweak it to suit you.
There is also a book, published in 2005 and actually in-print! It is $90 and I haven't read it, so I won't recommend it just yet, but it's at the library and I intend to go take a look at it when I get the opportunity. If for no other reason, Bagby talks about his unique methodology for "reconstructing" music that we have no record of - it should be interesting.