The extended cut was to clarify and explain things better?
-it added the what-the-crap evacuation scene. That explains the squadmates getting back on the Normandy, but brings up some questions. Why didn't Harbinger fire at the Normandy destroying it? Why didn't the Normandy just fly to the beam and drop off Shepard instead of doing everything before that? How was the Normandy able to get in front of the beam in a few seconds? Why didn't Shepard give medigel to the squadmates to continue? What was Anderson doing? I don't know what's funnier. The what-the-crap evac scene or the green ending. I would like for Bioware to explain how Steve ended up back on the Normandy.
- it fixed the flashbacks when Shepard is choosing whatever ending. This is the best thing I can say about the extended cut that it fixed. I don't know why those flashbacks couldn't of been in the original ending to begin with.
-it changed the relays not exploding if ems is above 2600. Before they were exploding no matter what the ems is. What's interesting is if ems is above 2600, the rings in the relay are only damaged, but when the ships are seen flying by a relay, that relay is severely damaged.
-it also changed the damage the Normandy received. If ems is above 2600 the beam of goodies doesn't damage the Normandy, but below 2600, the thrusters are seen being ripped from the fuselage just like in the original ending. The Normandy should be in pieces with everyone dead on the unknown planet
-it added the slides based on the players playthrough. That was alright
-the memorial scene. It was nice. Wasn't nice for people that romanced Miranda or Jack since neither of them can be on the Normandy to hold Shepards nameplate. It also brings up some questions. Who was it that told them Anderson is dead? How do they know Shepard is dead in the blue and green ending? Its hard to say someone is dead without a body. If anything i would have it that Shepard is currently missing. If ems is below 3100 and destroy is chosen, Shepard is dead and the nameplate is put on the wall. I would guess someone discovered the body confirming he/she is dead. Its possible its the same person(s) that discovered Anderson's body. If ems is above 3100, the nameplate isn't put up. That would mean that same person discovered Shepard is alive and there would be no need to hesitate to not putting up the nameplate
-the unknown planet. I have no idea what the purpose of having the Normandy on the unknown planet. The extended cut didn't explain or add anything about that. If ems is above 2600, the ship is seen flying off the planet. So what was the purpose of the planet? If ems is below 2600, the Normandy is damaged and the crew is stuck for however long. No idea how long they will be stuck on the planet.
-in the extended cut it shows the same number of ships flying by the relay no matter what the ems is unless its below 1750. The other thing is why wasn't any quarian ships shown, if alive?