Mad Hamish
First Post
I never really had that issue with the rogue; they have a higher AC and Reflex than the typical TWF ranger. A halfling Cha rogue can provoke OAs all the damn time and enjoy the gentle breeze of whiffs, which in turn can lead to punishment from the defender. Our dwarf TWF ranger wound up in plate just because he kept get hitting so often, and his player is shocked as hell when a Will attack misses, but he pours out damage like it's water.
I hear monks are fairly fragile, but they sure look fun.
The barbarian in our group takes a ton of damage, and also eats up a ton of my healing. He has practically no AC, and I don't think he did that much more damage than my battle cleric.
Brad
The big issue for rogues is that mostly they want combat advantage so they go for flanking positions which often leave them isolated (they are helped a lot by other party members having forced movement so that they can control where the opposition ends up)
A two weapon ranger can have issues depending on the build. The two main options are Str/Dex or Str/Wis.
A Str/Wis probably needs to go for scale mail for AC but a str/dex is fine and if you go Stormwarden and maybe pick up scimitar dance you do a lot of damage and have the option of ranged attacks.
Similarly a Barbarian can have AC issues but a common solution is to go the Fort build but put dex as a bigger stat than con and keep pushing it.