Don't want to sound like a broken record or anything, but if you want to do a raid, just start your own group. It's so much less frustrating
OTOH I kind of understand the raid leader's position on AAs. There are a lot of poorly played rangers. That being said, 1 or 2 poorly built, equipped and played rangers aren't going to kill your raid, so really it doesn't matter a whole hellofalot. I don't turn them down.
Rangers do get singled out a little more though. Rogues? I just don't understand that one. Assassins have some wicked dps even if you don't have decent weapons. It's one of the least gear dependent classes, which by definition makes them an excellent addition to the dps component of your raid pretty much without needing to examine them.
I tend to just look at a rogues HP. If it's 228, I don't want them in my raid. 450+ and you're in. I'd happily take an all rogue melee dps contingent. Stuff goes down _fast_.
I'm not saying I'd play a melee character with less than 500 HP, but 450 + improved evasion is Good Enough(tm)