1. The X-Men Vs. Dark Phoenix
The conclusion to Dark Phoenix in The Last Stand was like Magneto, very underwhelming and disappointing given the greatness of the character. Admittedly, the scenes where Dark Phoenix is shown unleashing her powers are quite good, but she doesnt seem to enjoy it as much as you would expect for a being of all desire, joy and rage. Jean Grey still exists within Phoenix, as shown when she asks Logan to kill her, and in the deleted scene with the little girl on the bridge. Imagine the final fight when Dark Phoenix starts destroying everything, the X-Men fight back (with the exception of Logan who is paralysed like in the comics), trying to get through to Jean. Through the words of Scott and the X-Men, Jean manages to take control, say goodbye, and destroys herself.
What do you think? Could a great final fight have saved X-Men: The Last Stand?