Excellence in Worship

We have a lot of conversations at Emmaus about excellence in worship. And I think that worship should be excellent. I used to think differently. All we needed to do was make a joyful noise, and God sees our hearts so it doesn't matter. That part is true. But perhaps that's the difference between being a worship leader, and a worshiper who's not leading others.
My question is, "what is our motivation for excellence?" Is it to glorify ourselves? Obviously not. Or is it to create a worshipful atmosphere for people? While this sounds good, is it really the right motive? Is it in our power to create that atmosphere? I think when that becomes our motive, our focus gets off, and we start playing music for people rather than God. My inclination is that we ought to strive for excellence because God deserves our first fruits, the very best we have to offer. And it's the Holy Spirit's work to touch hearts, and that the biggest thing we can do as worship leaders is to pray for that. To seek God with all our hearts and continually ask Him to change lives and meet people where they need Him most. Where we need Him most. Whether or not people meet God is not dependent on our abilities, whether the music is fast, or slow, or we have drums or not...the only way we'll meet God is if we seek Him with all our hearts. I think it's simpler than we realize. Any thoughts?