Field of view is extremely low for a PC game, most likely lifted directly from the console versions. I believe that console commands work in multiplayer and aren't considered as cheats (editing game files and memory will almost certainly result in a ban or lock online modes entirely).
There is a "FOV changer" program for the singleplayer and co-op modes.
How to increase FOV in multiplayer
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Best Answer
Some people state that changing the FOV may result in a ban, so I wouldn't take the risk. It's considered cheating and some servers block values beyond a certain point anyway.
In multiplayer games the FOV value resets constantly, so you need a key bind to set it back again:
Open the console (~) and type
bind w +forward;cg_fov <value between 0 and 160>(or whatever key moves you forward) to make that key both move you forward and change the field of view. The default value is 65 degrees. You can do that with other keys as well.