I've only played Borderlands 2 and thought it was ok, there was stuff I liked about the game but also things I didn't like. Haven't heard too many positive things about the sequel but maybe later on I'd be willing to get the new Gen version of them, I have the Tell Tale game (got it on sale a few weeks back) which I heard is good but I am waiting for all episodes to release before I touch it.

BL 3 is happening GB has beat around the bush for a while since they are working on some MOBA or something but like all you say lets face it BL is GB's money maker. I'd be willing to check out a third BL but I gotta see what they are offering before biting. Like I said I liked BL 2 and it is the only I have played but I thought it was ok nothing that blew my mind or hyped as some people made it/make it out to be.