I had no expectations when I started playing bass.I just wanted to be in a band and I could play bass better than guitar. Then I saw John McVie playing with John Mayall and my future was sealed.
Most audiences don't hear, understand or care about the bass and that doesn't matter. Some do, though. I regularly have people (not always bass players) come up to ask about my gear, style of playing and influences. It's nice when people notice, but the one person that always has to notice and you always have to impress is the band leader. If the band likes you then you're in business. Don't get confused, while they'll expect a good sound from you they are really only interested in the lines you play and how well you play them.
If you can lock with the drummer, play good lines and make the band feel good, then that's your job is done. I did a dep with a regular band last week, with a (very good) dep drummer, and we nailed it from the first number. The band leader later went on to Facebook thanking the two of us for making the band sound so good.
If your playing has made the band sound good then the audience will always notice that.