I've been playing one venue since the 80's and the sound is terrible. It has a concrete floor, brick walls and concrete ceiling. If you put the bass amp right in the corner then the sound is bad. Leave a 4' gap to the corner (the stage is big enough for that), and the sound become workable.
IMO there are amps and cabs that make bad rooms easier to handle, eg Bergantino, Barefaced and my old Mesa EV cabs, and some that do not work well in bad rooms. So having favourite amps at home or in the rehearsal studio is one thing but you might need a totally different amp to sound good on a gig.