Yeah, the quality isn't the best, but someone obviously thinks you're worth the time and effort to put it on YouTube for others to see, that's pretty cool.
If he'd posted it with the title 'f***ing sh*te band I saw the other night' or something, it'd be a different story, but as it stands I reckon it's a pretty good advertisement for you. I'm sure lots of people with see this and google you, which will lead them to your website, which may in turn lead to more people at gigs. Win.