Makes a lot more sense when you put it that way. A shitty venue can make you want to bolt early for sure.
I also agree with you on liking Mastodon's earlier material more than their recent stuff (with a few exceptions for me, obviously). It seems as if their current setlists are fairly well-balanced, though, so again I would have wanted to see that.
9/2 Chelsea Wolfe
9/5 Old Man Gloom
10/28 Acid King