I personally find most churches to be quite boring. I figure I have two choices. I can sleep in church or I can sleep in bed. I prefer to sleep in bed being as it is much more comfortable.
I prefer the informal setting of bible study groups and stuff like that, provided the people running it aren't completely boring themselves.
I feel I am allowed to say this because I have been to a lot of churches, probably in the area of 10 different churches... mostly because my friends always ask me to go to church with them. I figure I'll try it twice, if I don't like it I won't go back. This has given me a wide variety of churches. I'm always looking for a church I'll like and want to go back to, but I haven't found one yet. Still looking.