Ops being my favorite class , i largely agree with our friend Exe. Ops are very offensive class and disruptive. Did i said disruptive? Yes sabotage! Either in offense OR defense, the role of the ops is to distract, scout and do some sabotage on the other team defenses (yes even good offensive teams make defenses on CPs or choke points). Ill explain myself…
As ops, my first priority is to incap or find an incap player so i can Comm hacks them in order to show BRIEFLY locations of: 1 turrets, 2 mines, 3 enemy players, 4 ANY dead enemy players offering a disguise opportunity. Maybe EXE could confirm how long it stays on the radar, but i can tell its not very long.
When disguised, ill run around (with help of my comms hacks if i didnt got shot while doing it) and try to “act” like i am part of the enemy team, hence the importance to remember which name is what class. Its easier to run around as an enemy ops or Engy, since soldier often spams nades and meds revives. Its no good standing among the enemy teammates who are asking for ammos of helth buffs and running away from them often trigger a mass firing event on my little self (and of course death).
One other tactic ive learned from my hours of play with TAW is having a class disguise fitting the requirement to remove hacks, bombs or whats what. While standing on the obj, the team thinks you are doing the remove, but in fact, you are giggling as you see the timer going down. Sometimes one player notice something wrong (standing near your own engy , while he is also standing at obj or being hit by HB) and shoots you, either its late for them or they will try it anyway. It is at that time that i trigger my cortex bomb 
Back to my runs in disguise, ill keep a look out for the enemies movements by following them from a small distance, pointing mines along the way or hacking turret to add firepower to my team (and again mess with E-team). As soon as they start attacking my team, im placing Homing beacons so they cant miss any of them, even if they got cover. A great warning since you dont “bleep” on the radar if you got silent feets, silencers or just being a statue. At that moment, enemy team hears they are marked and starts to move in panic 80% of the time. It is at that moment that i pick a strategic target : either the medics or the primary class for the obj completion or removal. ill shot them point blank with a silenced weapon, in order to keep my element of surprise as long as i can in order to disrupt the enemy team’s push.
Throwing a sticky at a soldier will hopefully interrupt a bit his attack, throw in caltrops on the obj ground itself, doorway or choke point (i love when players slide into them…). Ill throw my EMP at them in order to mess with their radar or on the obj to stall it for like 3-4 seconds (OMG SO UBER!!!). AND if i had time for it, ill turn around a turret i stole and, with my remote controlling, spamming firepower while being in hiding.
Plus as an Ops, if i get to place a HB on a E-ops in disguise, it will remove the disguise instantly. Now I fail, like Exe and many others,to see how the ops abilities should be removed from the “competitive play” when the radar system show your position less than half the time. I fail to understand also why removing other abilities, it lowers the class as being useful only to complete a hack objective. I feel like its removing one class totally, removing what, a quarter of the gameplay . Fortunately, i wasnt planning to go scrimming on Brink, now that ive read this thread, even less. Ops are by far my fav class, and ill never approve playing on a server that ask me not to this or that when its in the game (unless its exploit).
sorry for the long post but seeing you guys bitching Dom and Exe over this matter makes me sick. If your L33T, fine its your way of playing, but its far from being everybody else opinion or wishes.