Well, for example, in nwctf they play maps that would be unplayable in ig, 3D and mid play is a standard meta on some maps (pug, league, whatever), and they have a shock that can spam combos at spawns and flag stands. Spawn raping is a standard meta on some maps (like cynosure where the mid guy rapes the enemy shock spawn constantly). Not to mention, they have no laming rules at all, but it's still never turtley except on really extreme maps like november etc.
Why is that? The main reason is that if you kill 3 people in base, they're gonna be scrambling to mid with trans to get weaps and try to cut you off instead of spawning in your face with sniper. Taking out the combos and six packs and playing on much smaller maps will make the game even faster. Perhaps maps like grendel and orbital would be playable again. Plus, people have been asking about nw, so why don't try something that might appeal more to them too?
Also, default enforcer isn't really useless as a starter gun. Has such a fast rof that it'll take a guy out with low health in a less than a second.
Just explaining my pov and expanding the idea a bit more
