I don't feel totally qualified to review the Bovine Sex Club because it's simply not my vibe. Through appearance alone I am assuming this venue caters more to the hard rock, punk and metal sort of vibe -- and so for that scene this place could very well be amazing?
But for me I am not really into places looking like they're some sort of post-apocolyptic bomb shelter. They have tons of chain-link fencing around the venue and other random creepy things hanging from the wall. I do like the busted televisions they have along the bar playing obscure b-movies though. And the men's washroom is surprisingly spacious and doesn't smell, from what I can recall.
They have a back room area as well with an additional bar. This used to be the "smoking room" when Toronto was going into its smoking ban transition, and this room used to be terrible with dozens of smokers going at it in a closed-off location. Not a good atmosphere. They used to also have very high benches, but all of this has changed and now it's a good place to re-locate if you want to escape the live band.
Again, if you're into hard rock, metal and punk then this seems like an awesome venue for you. I have seen bands there before and it gets very very loud seeing as the space is quite small. I can imagine things might get a little rowdy here... But if a band you like has a gig here I am certain you will have a pleasant experience!