[HereInTheHeartland]

“I suspect many of them are ex-Catholics who don’t and cannot relate to the serious liturgy and instruction of the Catholic Church. Clapping, dancing, swaying, rumba are all part of the Rick Warren theology.”

Wow!
That's huge and probably erroneous broad brush.
Most are probably from mainline, liberal infested churches.

Some of the mega churches do a very good job. They are not for me; as community with other believers would seem to be impossible in these churches.

[Steelfish]

You’d be surprised. Many of these “rumba” Pentecostalist/Charismatic Churches in Latin American are poaching on Catholics with an entertainment brand of “Christian Lite.”