No, it is not completely ready. Please consider that NEM is still in version 0.6.x. It can be considered ready if it achieved version 1.x. If you also look at the roadmap and the features which still should be implemented then it is probably ready for exchanging NEM as a currency but not enterprise-ready and not ready for mainstream adoption in my opinion. We will get a step closer when Catapult will be released soon hopefully. But basically there is still a long way to go. I like the approach of the developer team by doing constant good work and by not hyping the coin as other developers do.