With unlimited sprint and cloaking ability- add to that objectives that have to be physically obtained/maintained- and what do you get? Well, basically you get a street brawl with guns. That's right, up close and personal mayhem where a gun's range is a pointless as a bible at a strip club.
Sure if you really hate dying you can find yourself a nice perch and snipe, or shoot with a long range assault rifle from 40m and hopefully wear someone out before someone flanks you. But that's not the fun of C3. C3 is about getting down and dirty.
Someone asked me the other day what I thought the best weapon was and I said "the pole". Lets face it the pole is king. What other weapon is a OHK, it has unlimited ammo and you can throw it if needed?
So when you look at gun play balance, look at the gun fights then make adjustments.