I see a lot of horror stories from writers on here, and I don't get it.
I'm currently on Textbroker and working on moving up to better clients. I've been 4 star my entire time, never had an issue with reviews. As for the complaints like, "They blocked me accepting other articles after a coupe of weeks, so I couldn't pay my rent," they mention the five article block for new writers, and you are getting paid 1.4 cents a word or less so this isn't something you should rely on for money.
Clients that complain about keyword stuffing or word count inflation, this is what you get for 1.4 cents a word. A lot of the orders on the site come from clients that don't care about writing quality, they just want their keywords in a piece of an acceptable size. This leads to writers trained to focus on those aspects and not on creating quality writing.
I'm fine with writing on Textbroker for now. It's been a source of extra cash while I build better habits in myself. This isn't a long term writing solution, but it's good enough for the first couple of months.