I disliked
X-Men:Last Stand for similar dissimilar reasons. I disliked that they portrayed Jean as the Phoenix in a movie that didn't combine her and the cosmic entity physically and psionically. The end of
X2 hinted at the debut of the Dark Phoenix with what I hoped was either the entity RISING from the bottom of the lake or the reflection of the entity on the water DESCENDING to rescue Jean's body. It was her mutant power which initially attracted the Phoenix to Jean. I thought 20th Century Fox and the franchise would actually tackle the legendary storyline (what was
I thinking?
) Overall though, I didn't have an issue with the movie showcasing her powers--only that it did so weakly and it a cheezy way (along with how other characters were portrayed too).
The reason why I say that is because the pre-Dark Phoenix Jean was an omega mutant in my opinion. Even Professor Xavier recognized her untapped power potential when she was still an adolescent and implanted psychic barriers in her mind hoping to constrain them indefinitely. At least that is what I remember of the story from the late 70's/early 80's. It's individuals, who couldn't be (easily) classified as either alpha, beta or gamma, who were tagged as omega. Apocalypse had previously uncharted power levels also.
I do remember Magneto killing Apocalypse at the conclusion of the Age of Apocalypse storyline as well. The final battle between the two of them was an accumulation of planned attacks by Magneto's X-Men and fortuitous setbacks suffered by Apocalypse's forces, which ultimately aided Magneto's endgame.
I did some googling. Which mutants do you classify as omega?