I would say you should seperate it.
One VLAN Management (mabye in ESX Managemt or Switchmanagement VLAN)
One VLAN for Packet & Contrl.
Others for Data (server, user traffic)
Seperate Management ist just for security reasons
The others should be seperated, because the are very important to let the nexus Work, If packets are lost, the hole nexus will get trouble to work.
Additional you should think about QoS if you don't use a seperate NIC for that traffic. I would suggest to use a bundle of NIC's for evetyhing and work with QoS to be High Available.
Thats my point of view after discussion in a nexus training and with a cisco technician.