I have been a Christian for over two decades. I listened to Joyce Meyer a lot as a young Christian and found her focus on practical Christian living to be very helpful. I have also known several others who purchased her books and found them helpful.
I don't 100% agree with anyone (even some of the things I've said in the past), but I haven't heard anything from Joyce Meyer that I'd consider dangerously heretical.
For some reason, many Christians get it in their heads that it's their right to judge the ministries of others. I figure that it's Christ's church, and I only have a finite perspective. Why risk speaking against something that is potentially a work of God (unless, of course, it's an overt, obvious heresy). We certainly shouldn't dismiss something just because it's successful - that is logically nonsensical.
She posts a lot of her teachings on Youtube. I'd encourage you to listen to her and decide for yourself if her style of ministry and communication is a fit for you. Don't forget to bring God in on the decision.