Beth Moore is a mainstream Evangelical superstar who speaks with an impassioned frenzy that inspires many women to become fanatical followers. She is not (officially) a pastor or theologian, but she serves both of those functions for millions and millions of people in the church. She first gained popularity in the 1990's when her theology was viewed as middle-of-the-road, Bible-based, Baptist teaching, but her teaching has become more mystical and subjective over the years. Beth Moore sometimes refers to her own direct conversations with God in order to establish and validate her teachings, and she emphasizes unity in the church over sound teaching about important doctrinal matters. Moore has partnered with and endorsed Word of Faith false teachers like Joyce Meyer, Joel Osteen and Christine Cain, and she is featured prominently on TBN:

Because she has established herself as solid and dependable (partly through very good and consistent marketing), she is rarely questioned by Evangelicals, who believe a brand name Christian author must be speaking the truth. 

The following articles are from different Christians who are coming from different theological perspectives, but they all agree that Beth Moore's teachings are not totally trustworthy and Biblical, and in some cases, she is teaching ideas that go directly against God's Word:

The Mailbag: What did you think of Beth Moore’s “A Letter to My Brothers”? by Michelle Lesle

Why Your Pastor Should Say “No More to Beth Moore” by Delivered By Grace

Beth Moore Predicts God Will Unite All Sectors of Christendom-Pulpit and Pen

Beth Moore's Strangely Disappearing Tweet: A Discernment Lesson by The End Time

Beth Moore's Illicit Tent of Meeting (includes Video Lecture) by Bob DeWaay

Beth Moore-False Teacher by The King's Dale

Beth Moore Analysis by Christian Apologetics and Research Ministry

Multiple Beth Moore Articles by Berean Research

Breaking Free from Beth Moore and Her "Try Hard" Theology by Lisa Nunley

Beth Moore Displays the Subtle Deception of False Teachings by 828 Ministries

Straightening Out Beth Moore on Discernment by Apprising Ministries

Five Reasons It's Time to Start Exercising "Moore" Discernment (with links to more articles) by Michelle Lesley

Beth Moore & Priscilla Shirer– Their History of Contemplative Prayer and Why War Room Should Not Have Used Them by Lighthouse Trails Research

The Teachings of Beth Moore and Living Proof Ministries on Issues, Etc.

Multiple Articles About Beth Moore by Apprising Ministries

Multiple Articles About Beth Moore by The End Time

Multiple Articles About Beth Moore by Apostasy Watch

Goodbye, Beth Moore (with links to more articles) by Guarding the Deposit

Many Episodes of Fighting for the Faith featuring Beth Moore

For further reading and research:

Defusing Demonic Dirty Bombs

Confirmation Bias: Why You Are Protecting Your False Beliefs

Assertions and Assumptions are NOT the Foundation of the Church

The Gigantic Problem Beneath the Really Big Problem

A Manifesto of Christian Discernment

This article by Steven Kozar; check out his new and improved: The Messed Up Church website!