This applies to the drums as well. The bass and drums are the heartbeat of a band. Too many drummers today want to show that they can play a 4/4 beat with 4/5 timing, and it might work, but does it make the song flow? If it doesn't make the song flow, then it's crap. Listen to the great bassists in great rock bands, and even if they are pushing the bass line as far as it can go, they still make the song flow. Ringo Star was the best example of this. Ringo Star is an incredible drummer. One of the absolute best. He was able to keep time so well that they could take multiple takes of a song in the studio, and he kept the beat so well that they could splice the different takes together without a hitch. This was before drummers had metronomes in their ears.
It's not about your technical proficiency. It's about if you can make the song flow. I'm not the greatest drummer in the world, far from it. But I can make the songs flow, and every group I played with wanted me to play with them again.