One must be more professional than the pubs they are working for. Aside from playing skills, being responsible, punctual, accomdating and proactive to the needs of the establishment are part and parcel of being a pub musician.
I say this because, I, as a musician would rather be stressed out by employees, than to have none.
As to answer your question, there are many bands out there playing nights, al with different levels of musicianship. I guess its really to the person auditioning you as James mentioned.