There's nothing wrong with Forest River, or any brand for that matter. Depending upon who posted the negative comment, more than likely, they don't even own a Forest River, they are parroting someone else. For every 1 negative poster, there are hundreds of very happy and satisfied owners that never say a word. And, it doesn't matter what brand of trailer you're considering, you're going to find negative reviews... on all of them!
I still think people who post the negative reviews are simply parroting someone they know, or are disillusioned what RV ownership entails. They have myths about RV that simply are not true. Like... they should be built like a house, never have issues or problems, they are ready to go and solidly built like an automobile, and dealerships should jump through hoops when you have a mechanical failure or a warranty issue. Not true for any brand! They all have their problems, they all have bad dealerships, they all have mechanical failures, they all have warranty issues, they all have a lemon that past the cracks. It's just some you hear about more than others.
Also, consider the quantity of RV that are sold compared to the number of complaints.
You don't hear much about Airstream because not that many people buy Airstreams. Airstream owners are kind of like a secret society.... they seem to keep everything "hush-hush" even when things go bad.
On the other hand, Keystone or Forest River outsells Airstream by mega-fold. So if you have a million people buying them, you have a million chances of hearing about complaints. Airstream may sell 50. What are the odds of bumping into a bad review ... if you can find one at all.
Lots and lots and lots people are satisfied with Forest River. You might want to reconsider.