To the people that think it would be better to just stay at home listening to the cd if a band isn't acting like a bunch of clowns on stage, you won't get it even if I described the experience further.
I think you have gotten the wrong impression. I don't need a band to "act like a bunch of clowns" to be entertained. No one said that anyone had to "jump around," do back flips or cartwheels, twirl and throw their drums sticks, or do any other specific action that has been stated or implied in this thread.
But live music, IMO, should show the life of the band. I understand that there are similar elements in some cases, but it's not a classical orchestra ... it's a metal band! If I was going to see an orchestra or an acoustic set by someone, I would expect too much in the stage presence category. But when I go to a metal show, or even a rock show, I want to be entertained by a live performance, which, to me, means more than just standing or sitting on the stage playing some songs.
If I pay to see a band
live, I'm coming in hopes of more than just music. I want to see something from the band themselves. Yes, they are up there playing, and live sound is different from the sound you get from your stereo at home, but when I pay to see something "live," I don't feel I'm just paying for the music, I'm paying for the show. You don't need to be Cirque du Soleil, but you should do something more than stand there.
Regardless of the comments on this thread about that not being important, it will still be a major factor for me when seeing any live metal or rock show. I still plan to check out Riverside's live show next year, but unless I find that I am totally blown away by their musicianship on the albums between now and then (which sounds like it could be possible), if their stage presence (or lack there of) bores me, I'll probably listen to a few songs and that go grab dinner.