I have never been there before, but was supposed to go see TSO today. With the blizzard down here, though, we scrapped our travel plans for today. Sounds like I avoided disappointment, then, if it is that bad.
i think it depends to on where you sit for a show and what kind of show it is.
Most of these places are not designed music shows therefore there acoustics are inherently bad.
I'm sure there is some sweet spots.
I've always found right in front of the sound board isn't too bad.
Northern Lights is better if you move around and find that sweet spot.
I was there for a show and 30 feet from the stage sucked - but 45ft back and next to the bar I could hear everything much better.