I agree to all the posts above. reg mode EV is 100% puggable and I actually did my first EV (all bosses) in a Pug.
vent/Mumble always makes life easier.
Last boss is though easy requires coordination and your tank needs to know what he is doing otherwise you wont be able to do it
It is the mix of Lich king (mind traps, blue shiz on ground, lightening balls), Anub'arak (kiting boss to a fixed spot under the yellow thingy dropping down).
All the best