Angry..? Well, not quite. Perhaps disturbed, at times!
It often seems we have little patience to wait until good quality demos come out, and many people make their minds up LONG before the dust has settled. Perhaps that's just the nature of a cross-platform forum, some people can't think good of their own arranger without putting another one down.
Me, I can't tell. Sure, it sounds pretty much like a PA2X, and that's not surprising. T4 sounds pretty much like a T3 to me, too. And the E80 sounded pretty much like a G70. That's the nature of the beast. And as you have said, he is STILL playing a beta, so there's plenty of room for change before the release (and after it, too - Korg are not like Yamaha, they WILL bring out software improvements rather than make you buy another arranger to get them).
When the first official units start shipping to the dealers is when we are likely to FINALLY hear it in its finished form. Until then, at least these videos keep our appetites whetted (and give the naysayers something to gripe about!). I can definitely tell that Dennis is getting interested if it has Makeup Tool ease of use in it. Me too, TBH. Makeup Tools is one of the MAIN things that keeps me locked into the G70. I do a LOT of 'tweaking', and anything that makes that easier is great by me! If Korg can make something that makes style editing and tweaking as easy as Roland have, it is going to be a big factor in whether I consider one.
In the meantime, meh..! I am not so fired up about ANY new arranger that a disappointing amateur video of a beta demo is going to ruin my day! I can wait for the good stuff without HAVING to come to a decision now...
Angry...? No. Resigned, maybe..!