I have found rogues to actually be the most dangerous class on the server, in both PvP and PvM, when played effectively and to their strengths.
When I step out of the temple with my high level sorceress, It's rogues that I worry about, not clerics who I can dispell into uselessness, Not fighters who I can freeze in their tracks, and not unprepared mages who are statues in waiting. It's the rogue that I can't see and who can knock my health down in one hit, and if they are hasted with two weapons, they can get a good three or more sneak attacks off at once. A class is neither weak nor strong, how you play that class counts.
*Addendum*
Don't get into a straight fight with a rogue and then try to compare them to a fighter.
I saw one of those greatest warrior simulation shows the other day that annoyed me.
It had a spartan fighting a Ninja, the Spartan won because for some crazy reason the ninja didn't just poison his ass.
THAT's the deal with rogues.
I'm not quite sure you know how this works then
... not even the dual weild should really matter.
Level 20 a rogue gets 9d6 SA. When doing dice it's best to use the average, the average of a d6 is 3. pretty much half. 3*9= 27 Damage. plus their weapon which is more than likley a 1d4 or 1d6. For this example we will say he munchkined out and went short swords or rapier. so 3. chances are he has little to no strength but i'll give him a 10. so he doesn't negative. basically... 30 damage, flat footed. against a level 20 rogue for an SA.
How much con does your sorcerer have? O.o ...I don't suppose your sorceress is an elf either? Rogues are probably the most vulnerable to magic. even if they do hit you with sneak attack. My wizard was almost assassinated one day. I got hit by a dual weild sneak attack from a player either a level over or equal to my level. did a good bit of damage, didn't kill me. If it was just him I would have ended him right there and then, but it wasn't so I fled. While running away I left behind Evards Black Tentacles. Rogues have crap saves there fore paralyzed and took multiple damage. the chase scene ended with me getting Barley Injured from sneak attack, going down to injured when shot 2-3 times with a crossbow. That rogue on the other hand almost died as I was
fleeing. I wasn't talking about a straight fight either... Rogues need the shadows but once they pull their sneak attack. That's it. you are aware that they are there and then they gotta bolt. Running around corners trying to spam stealth doesn't work, if you have HiPS that is good but you need to apply for a prestige class in order to get HiPS. Straight up vanilla rogues kinda herped. It sounds as if your sorceress simply doesn't have enough constitution. At least from my understanding because not even a level 20 sneak attack is enough to eliminate all of, you know... not even just my wizard. Some of my level 2's can survive that!
To say there is no such thing as a weak nor strong class is, for lack of a better word "bull". There's always has been a meta, and powerful classes. Classes were even purposely made more powerful than others simply because it's the general universal lore of the world. The man who is magic is going to be stronger who isn't. That's just facts, it's just flat out numbers. You even said it yourself. Your sorceress can just debuff clerics, you can handle fighters just fine, it's over my head how you can't handle rogues. Especially if you can handle clerics, whoa re amazingly powerful on PoTM for a huge variety of reasons which I don't need to explain since i'm sure a good ton of the player base can explain "Melee Cleric".
Casters run the game. That's how it's been and it's been purposely written that way because that is simply how the game was designed. It was designed for role playing not for balance. If the concern was balance then you'd be better off looking into a more competitive game or world of warcraft or something. Clerics, Wizards, Sorc's, and Druids all have an answer to the mundane classes. They are very powerful characters, that's why when I DM tabletops I take people who play those classes into very good consideration to make sure everyone else has a chance to role play some and feel useful even though the wizard can do just about everything the rogue can only better.
I have heard of that fighting show, and that episode. Deadliest Warrior or some crap. People get overly buttmad about that show all the time. There was also more than one fight. The Ninja won every time he successfully got the jump on the Spartan, in a straight fight however the ninja would lose simply because he couldn't bypass the Spartans shield. Oriental Blades were sharp enough back then to cut through flesh like a hot knife through butter, however they really weren't meant for handling armor that much.
Going to just say however, we are getting horribly off the topic of "Feint" as an combat maneuver. It probably won't make that huge a difference to be honest. It will simply create a new type of play style for rogue that would be more fitting for certain types of characters. Since nobody is going to power dex and charisma. you pick one or the other. You could probably munchkin it out, but are we not here to role play?
More Options = More Possibilities. Imagine if you were only allowed three classes, out of the bunch we have access to. Then imagine if you only had access to: Power Attack, and expertise as combat maneuvers. Kinda boring, no disarm? no knockdown? Classes, Feats, and Class features serve as tools for helping you grant powers and playstyles that fit your character. There is always a downside to adding too much stuff. Just think if the only three playable classes were Rogue, Wizard, Fighter; and that feat choices were much smaller. Oh and no multiclassing. It's what makes Dungeons and Dragons so revolution. You build your own hero/villain.