I too have attended a Mormon service, as well as a Seventh Day Adventist service and a Jehovah’s Witness meeting.
I did it out of curiosity but never was even considering actually thinking about joining.
The people may be friendly, sometimes to friendly I feel like. People say Catholics don’t converse at mass and it’s less friendly. That has nothing to do with it. For Catholics, Mass is a liturgy. It is holy. You can converse following Mass.