It has a very large community of users and with the best support for this type of applications. It has the best prices in the market and even has a free version for small businesses.
Many errors in Multi Company, bad interface between electronic accounting from México and multicompany functionality. Hard to develop reports, the product need a similar as Crystal Reports from SAP.
Support does not answer questions, they stall, they deflect, and when that fails, they fall back on asking for an "Odoo only" version of the software to test the problem.