In the church I went to, it was very polished. They had a Branson theatre in mind when they built the place, and that is how it functioned. For those who have, praise be to God, never been to a Branson theatre, they are slick moneymakers. They do two shows a day, a matinee and an evening performance. They are all built on some inane premise, mostly either "hillbillies are dumb and have no teeth" or "the decade in which you grew up is SO much better than this decade." So hillbilly clowns grace the stage for far too long, while others tell bad jokes designed to make the audience feel superior to the fine people who live in the Ozarks (BTW, we've produced some fine minds--Edwin Hubble, astronomer and inventor of the Hubble Telescope, was an Ozarks hillbilly). Else the show is full of nostalgia, and Elvis and Beatles impersonators are ubiquitous. One thing that doesn't change, though, is the pandering to veterans (and I mean no disrespect toward veterans, only to the people who coddle them for money: the latter disgust me). During every show it seems, there comes some time when the veterans are instructed to stand up and everyone applauds them. They all do this because the average age of a visitor to Branson places them at just the right age to have fought in WW2 or Korea, and they want these people to feel special so they see the show again and thus spend more money. It's sick.
This is what this church had in mind when they designed their current building, and the service follows the idea pretty closely. They sing some feel-good songs for a few minutes, never spending more than about two minutes on each song. The lyrics are short and repetitive so everyone can learn them easily. Next the pastor gets up and addresses the crowd and shows commercials on the Jumbotrons for the "ministries" the church offers. Then the musicians resume with soft, innocuous "I could sing of your love forever"-type worship music that may or may not say anything about God. Most of them sound like easy listening love songs--Sting, James Taylor, etc. After this, the pastor gives his sermon, which is long and (what do you expect?) is accompanied by PowerPoint. It's only on a handful of topics--usually sex or money. The former is easy to talk about; just give the Republicans' current position, and churchgoers will agree with you and think you've set a hard line against those sinners. The latter is often talked about because that's mainly what these churches are about: attracting the greatest number of people they can, and to do that, they need to provide every luxury imaginable, so they ask for money. A lot.
The two things you will never find in this service are communion and baptism. Those are always done on Sunday or Wednesday night so as not to make seekers feel uncomfortable (yes, that was the actual answer I got from a pastor at this church).
This was my experience. I'm absolutely certain it varies greatly from other Pentecostal churches, and is probably more representative of a nondenom megachurch than it is a typical Pentecostal church (this church has nearly 10,000 members, and the building sits on 40 acres). Still, this is the church where most of the administration of the Assemblies of God attend, and though I'm not sure if the Pentecostal Pope attends there, I have seen a remarkable increase in the number of similar Pentecostal churches in this area.