Here are some issues:
-The shotgun is terrible. Honestly you can go behind a dude at point blank range and shoot him and he will have time to turn around and kill you with a submachinegun before you can shoot again. Its just bad, the damage is not that high, the range svcks and the rate of fire is the worst part. At the very least the rate of fire should be buffed, even if its less accurate.
-The grenade launcher is also useless. Its harder to get a direct hit with this GL than in TF for 2 reasons, the guys move fasters and in different ways and the weapons physics in general seems kinda random. Even so a direct hit will not only have almost zero splash if any at all, it will only apply a knockdown effect. Im not saying we need DEMOSPAMS but it should at least have som aoe or firepower for a weapon that can be harder to use than a sniper....
The other weapons are OK i guess, cold use little tweaks here and there but they all their uses. Now about the classes:
-The operative needs a buff. What is the operative role in match? To get behind enemy lines and kill them would be the most important one (not talking about mission objectives) but even so he lacks the offensive firepower of the soldier or even the engineer. The operative has some support in the form of revealling the enemy positions but that's about it, its nt useless but it is worse than the other classes support, which would be fine if he made up with offensive power.
But without any self buff hes not that good in direct fights, I understand his concept as a more tactical fighter but I think that some simple buffs could be used. For instance:
-Comming out of a disguise could give you a temporary damage buff.
-Any form of quick time cloak would be great and better to reach behind enemy lines. Hell even smoke grenades would be usefull.
With that said I do think that the tower hack is kind of OP and that caltrops are awesome.
The soldier and the medic are okay, the engineer is probably the strongest class, he has so many objectives and buffs, can earn the most xp of all, even more than the medic.