In my humble opinion, Reformed churches tend to be very cerebral, and far too many Blue collar Christians tend to be disdainful of ""book-learning"". I have had far too many blue-collar believers tell me that the only book that they will ever read and need is the Bible.
Ain't that the truth!!
My dh was an elder at our former church and as he was beginning to be Reformed he tried to share his excitement with the pastor and fellow elders only to be shot down with the admonition not to get puffed up with knowledge.
At one service (in their terms, "meeting") the wife of one of the elders made a disparaging remark about "Caaaaalvinisssssmmmm" in a tone that made it seem like a four letter word. Dh and I still laugh over that one!!
But seriously, the folks in these types of churches need our compassion and prayers because they are so impoverished spiritually but think they are rich and prospering in their souls. If only they knew the richness of what Christ has done for us and who we are in Him! Becoming Reformed was for me like being born again all over again and almost three years in a PCA congregation has done more for me spiritually than all of the 28 years in our former church. I pray that the Lord will bring His people out of such environments into churches where His Word is faithfully exposited and lived out.
Just a side note.....many bemoan the fact that it seems as if few are saved into the Reformed faith. That may or may not be true. BUT.....we should be so very grateful that there are Reformed churches ready to welcome and nourish those from Arminian/charismatic/pentecostal backgrounds whose eyes the Lord has seen fit to open and whose spirits are hungry for His truth.