Why would they be frustrated? A person can feel frustrated when he/she is not used to it, but anyone can get used to it pretty quickly. Afterwards it's all about practice and testing of different setup/loadout.
Besides, just like darkwind said, if you don't like the PvP here, just don't fight and you won't get nervous about it.
- Otherwise you will have to get used to it and practice from then on, you will get used to it pretty quickly.
(IMHO)
And on another note, who cares if you win or lose? This is just a game, have fun regardless of the outcome. Not to to mention that every successful person has a lot of losses before the winnings, so...