I think you're running into a few different problems:

1) People are assholes. If anyone demands a 5k GS to go to Naxx, then they don't know what they're doing. They just want an easy ride and not have to actually execute proper strategy on the fights. Back in the beginning of Wrath guilds would raid Naxx with an average GS of 3.4k.

2) The way the game is designed its nearly impossible to go into a raid boss fight blind. You can do it in 5mans and learn on the fly, but raids take careful coordination. Watching videos is helpful, but every raid boss needs some explanation by the Raid Leader to make sure everyone is on the same page and adjust for the class balance and personal quarks in the raid.

3) End of expansion burnout. Wrath is nearly over and everyone is looking forward to Cataclysm. The guilds that are still raiding want to get their progression kills, epic loot, and achievements in before Cata. They don't want to babysit new people at this point, they just want to play. The good news is when Cata comes out the fights will be new to everyone, core class mechanics will have changed, regulars will be refreshed, and there will be a lot more tolerance for new raiders.

There is always going to be some out of game research that you have to do, but it shouldn't be more than:
*Knowing your class (what talents to take, what stats to look for on items. what rotation to use, etc.).
*Knowing which addons to get (boss mod, threat meter, etc.)
*Knowing what the abilities raid bosses have and the general flow of the fight (ex. Phase 1 boss does X I avoid Y, Phase 2 Boss summons adds I switch to adds, etc.) The specifics of who stands where, how the boss is going to be moved, which healers have which targets, etc. should be handled by the officers/raid leaders.