One of the most half-a**ed shows I ever witnessed was CSN @ wolf trap a few years back.
Hit the parking lot very early.
They were back @ the lube a few years later opening for Tom Petty (who was fantastic) and were mercifully brief, although somewhat more together.
However, the last tour w/Y was awesome. He always lights a fire under those guys, but still leaves them in the dust.
Without Y, it's just not worth the bother.