Regarding Oasis, I don't know if it's still an issue, but the last times I get there around 2006-2007 we could see lot of age discrimination: being older than 30 y.o. was obviously an heresy. Heard it was very quiet these days.
Centre-Ville: get only one time last year, absolutely not my type. It was a total bore - maybe a bad timing!?
Cannot judge regarding Colonial, never been there.
I was a more or less regular at GI Joe, Had a lot of awesome as well as awful experiences there. Despite the "bad" parts still my favorite around. Hope they will reopen.
In the meantime, will probably try Oasis - we'll see! 🙂