Say what ya want about gear, but there's a definite imbalance in classes. What's the ratio of pro guards/recons to strikers? 1:5? 1:10? That alone should say enough.
In any fighting game worth a damn, there's a balance of speed and power. You're either fast, but kill enemies with a thousand cuts; or you're slow, but when you strike it's devastating (we're gonna ignore that speed/positioning is actually worth far more than power at high level play; we're talking about amateur level). As is, swordstrikers are both. It breaks the balance of power. I'd prefer to see the striker lose the sword dmg, but gain gun speed. Forcing swordstrikers to give up a heart trink to reach max dmg would then turn them into glass cannons of sorts since they're losing out on even more hp.
Damien is pretty mugh right (to an extent of course)
Its more about tactics that equips (ok equips matter, because you shouldnt be going in with 3* in T3)
Also for the gunners that use strikers and go in circles, the way to counter them is jut run towards them in the opposite direction they are circling. They wont be able to turn and shoot fast enough and you can get 1 or 2 hits on them.