Well, I can tell one way to not have any fun, and that is farming for cert-points, if you do that you will never enjoy the game, just do what you want to, the default guns are my favs, This is not a game you can play to win. You just have to have fun.
I used to be TR, but so many ppl + friends play NC I was forced to change, as for Vanu they should all die, infact TR and NC should take a saturday to team up and crush them for their petty insolence.
I was going to say pretty much all of this (except the TR bit). Right now what I'm hearing is "I'm gameing the game, why is it not fun?". It's like people who purposefuly utilize exploits, then complain how the exploits ruin the fun of the game. The cert points are designed so all play styles will gain xp/certs, not so that you can carefully calcutlate maximum cert intake/hour and carefully craft a 20 stage plan to increase point growth.