No, he isn't bad. He is a great person and a great doctor. He Works at University Hospital in Barcelona, he's a Fitbone trainer, and an expert consultant for Limb lengthening and reconstruction for European Union. The only people who criticize him in this forum are trolls who have been acting like this for years. In spite of having been banned many times, trolls always come back under different aliases, and their remains in the forum. This is the Law of the Web. Brilliant people get haters.
If you want real information, you should better read the diaries by Auron, Yagen, Fourinch, Helloworld, Krp1, and many others, as Dr Monegal is the doctor with most diaries in this forum. You can also write to the patients or to Wittenstein itself (info@wittenstein-intens.com). They recommend Dr Monegal for this procedure, and that's for a reason. Why would they recommend a bad doctor?
It's true that Dr Monegal has had some difficult cases, like Musicmaker's, but the doctor fixed and supported her. She should be considered his best case. Some patients, including me, can confirm she's doing well.
In short, the industry supports him, the medical boards support him, his patients support him. Trolls are the only users who attack him. Following trolls or real LL patients remains at your choice.