I did the Pub Crawl a couple of years ago.
It was quite enjoyable.
It involved only two pubs.
We were accompanied by two musicians who sang mainly well known songs in the private upstairs room in each pub.
They also asked anyone who wanted to sing, to perform a couple of songs.
I would say that it is mainly aimed at tourists and they should enjoy it.
I felt it was quite short, being less than two hours long and finishing about 10.00 pm.