All ERP is terrible
Every single one is awful, some are worse than useless. SAP for example has been responsible for huge losses (Levi), and I don't know anybody at all who likes it.
Yet the others are no better, ans sone are worse.
Several large organisations use in-house ERP, however I don't think they are likely to open source it because it's a huge commercial advantage to have really good ERP.
Biting the hand that feeds IT
