I came here last weekend for the Oddball fest, and had no issues with parking, lines, etc. The food options were mediocre, but I don't think you really expect much from a concert venue. They did have a Gardenburger, which was a welcome change from the usual veggie options of nachos and pizza. Food and drinks are expensive, so I would definitely make sure you bring a lot of cash, or you'll be stuck waiting for the ATMs.
We sat on the grass. The acoustics for the comedy show was fine, but I could see it lacking for an actual concert. The grassy area got cold at night, so I would come prepared with blankets!