If you are referring to NFS mounted devices from a NFS filer such as NetApp - then absolutely. If discussing NFS filesystems from a different host - then no.
Pro's & Con's of raw vs. file system
Pro's (raw): Good performance without a lot of extra effort
Con's (raw): You need to size correctly upfront - less flexibility
Pro's (filesystem): Greater flexibility in device sizes, locations
Con's (filesystem): Unless you know how to tune the filesystem (e.g. disabling journaling, etc.), tune the IO scheduler, etc., performance can be a bit muddled compared to raw. With tuning, on some hosts, it might exceed raw.
The actual decision is more likely dependent on your SA's. If they get locked in on tuning file systems for capacity and generically do them all the same - no exceptions - then go raw just to remove the headache of dealing with them.