Use the esxtop command and then the n and v keys. The q key will exit esxtop, when you are finished.
In addition to ESXTOP, you can view additional stats using ESXCLI. Take a look at this blog article for more details http://blogs.vmware.com/vsphere/2013/01/network-troubleshooting-using-esxcli-5-1.html
you can still use esxcli network nic stats get -n vmnic0 and get the same output from the command prompt in ssh of your ESXi.
Also, in case, you are MORE interested in more details, you can also do
vsish -e get /net/pNics/vmnic4/stats
Again, do try to use vsish only if you know what you are doing. It is only for troubleshooting
Thanks a lot for your answer!!
vsish -e get /net/pNics/vmnic0/stats - works great!!!!
when I typied "esxcli network nic stats get -n vmnic0"
I get "Error: Unknown command or namespace network nic stats get" (ESXI 5.0)
but I think I'm good.