It depended...and this sounds weird but there's a really noticible difference between congregations with mostly black (they sing well in my experience) and white people (they sing like crap in my experience.) The last few congs I was in had pretty bad singing, and I noticed it doesn't seem to matter whether I was way up north or way down here but if the cong lacks black people, the singing sucks, no clue why. My last congregation was almost completely Hispanic people and the singing was very soft and almost monotone, the congregation before had a very diverse mix of people (Nigerians, Thai, Japanese, Chinese, white, etc.) so some people sang really well while others sang crappily. Probably the worst was the same cong. that shares a hall with my mom because there had been some very strange older people that would sing the complete wrong words or the right words but the wrong tune (how in the world they did that with the music playing the correct tune is beyond me) and so on.
When I was really in I loved to sing the songs fairly loudly, espescially at conventions or if I was with someone else who sang loud. I'd get weird looks if I tried to harmonize with people though =(
As a side note, I really like my church's music, there's a woman who leads the group in song and who plays acoustic guitar and her husband (I'm guessing) plays the bongo drums. Even the big screen that shows the lyrics has pretty graphics, the background they used today looked like it was snowing!