Personally, I've never attended an Assembly of God church. There aren't many Assembly of God churches in my area, only three that I know of right off the top of my head, and they aren't especially close to me. The Church of God (Cleveland), Baptist, and Apostolic Pentecostal churches are more common where I'm from.
In saying that, however, I know the Assemblies of God are (collectively) the world's largest Pentecostal movement, but it does seem to me that they have moved slightly from their Pentecostal roots. I had a cousin who's family attended an Assembly of God church, and she was completely unaware that it was a Pentecostal church. I was quite puzzled that she didn't know, but she told me that she had not once heard the pastor "preaching Pentecost" or any of the Spirit's gifts being practiced, whether it be tongues, interpretation of tongues, anointing and praying for the healing of the sick, or prophecy, etc. My cousin assured me had she witnessed these things she wouldn't have went back because she doesn't believe the Spirit's gifts have continued into the modern church (she's mostly definitely a cessationist). My cousin and her children now go to a Nazarene church.
I've heard talk about the other Assembly of God churches in my neck of the woods, too. I know one of them use to send their saints to "teach" new converts how to speak in tongues, which I most definitely don't agree with. The infilling of the Holy Spirit is a gift from Christ, and tongues is one of Spirit's gifts. It isn't anything that can be taught. And if one does "teach" believers to pray and/or speak in tongues, I would call that blasphemy.
I don't know if the Assemblies of God are drifting towards cessationism or not, because their website insists it still believes the spiritual gifts are for the modern church, and I know they generally require Spirit baptism for ordination. I have read, however, that some Assembly of God pastors and leaders have questioned whether or not if Spirit baptism is always evidenced by tongues. In this matter, it seems some have drifted more to a Charismatic theology. However, the Assemblies of God fellowship still requires Spirit baptism as evidenced by speaking in tongues as a qualification for ordination.
In conclusion, I think it's just the Pentecostal experience isn't preached as strongly or with as much emphasis as it once was in most denominational Pentecostal churches as it use to be, which I'm sure contributes to the churches' slow but gradual drift from its roots. They still believe the gifts are distributed to Christians today, so their not cessationists, it's just their not preaching them or possibly not even receiving them.
