According to the hivemind, it is. What are those reasons again? If they're anything like "I don't want to see Magneto" I don't expect to be particularly impressed.
A) There's really no need to call people drones for disagreeing with you.
B) You still haven't provided a single logical reason why Magneto in this position was in any way good for the movie.
C) For formatting's sake, I'll leave the reasons to the end of this post.
My point was what it was.

mean like the dramatic possibility of horsemen turning against Apocalypse because of not being one-note villains?
This goes back to heroes struggling as horsemen being the entire point of the horsemen. Ie, EVERY theoretical star horseman imaginable would provide that same dramatic possibility unless the filmmaker plays the horsemen as straight minions which would be grossly incompetent.
So, off the top of my head, the reasons I recall for why Apocalypse is not a good movie:
1. Apocalypse is not a good villain. His powers are inconsistent. His dust attack from the first scene could've automatically ended every other fight, but he completely forgets it exists. His visual design is poor and doesn't really fit his character. His motivation is utterly generic and most of his villain speeches are off the rack 'I will save you my children' diddies which mostly just make him sound like a more pompous Magneto. The character's trademark philosophies which make him unique and interesting in the comics were only barely mentioned once or twice and never once acted on. In the final fight, he just stands stock still while everyone shoots at him for like five minutes straight. Probably the most boring scene in the entire franchise. Also, his horsemen are terrible. We've already covered that Magneto made an utterly boring and worthless horseman. Storm wasn't bad, but she was barely in the movie. Psylocke was in the movie even less and was actually pretty poor in general. Angel was a complete and total waste which even the filmmakers themselves didn't seem to give a crap about, as he had no decent scenes, no name, and no personality.
2. The movie tries to give Scott character development by losing his brother Alex. Alex dies after a single abbreviated scene with Scott that didn't even come close to actually establishing a relationship between them and the whole thing is almost immediately forgotten.
3. Quicksilver is reintroduced by ripping off the exact same power sequence he already did in DoFP, but now it's totally lame (Pizza Dog! LoL!) and has zero impact. He then spends most of the movie dancing around the fact that Magneto's his dad, which everyone already knew before the movie even started. And after arguing for a ridiculously long time about whether he can tell Magneto thereby finally fulfilling the obvious plot advancement that this entire storyline exists to serve, he chickens out leaving his entire character arc just hanging in the wind while completely robbing Magneto's storyline of the only real dramatic potential it could have had.
4. Wolverine has no place in this movie and the entire Weapon x sequence serves no story purpose whatsoever beyond simply separating one group of kids from the rest, which could easily have been accomplished in hundreds of different, simpler, more plot relevant ways (including simply leaving them at the mall to begin with, which would also have made the movie better: more on that later). But, because Hugh Jackman Must Be Worshipped, the movie comes to a screeching halt for like 15 minutes just to indulge in Weapon X continuity porn. And also, having a *teenage* Jean Grey hold an intimate 'tame the wild beast' moment with her future flirt partner who is literally a hundred years old is just creepy.
5. Back to the movie's climax: Apocalypse unleashes the worst devastation in the history of the franchise on the world and it has no impact whatsoever because the movie is completely and totally divorced from all the regular people. There are no non-X-Men characters for the audience to care about (which could easily have been fixed by showing the teens interact with regular people in the mall instead of dumping them in Weapon X) and all that is left is just generic cgi of buildings collapsing with no emotional impact. Also, Magneto commits literal genocide is allowed to walk with no consequences. Also, Moira out of nowhere and for no particular reason casually forgives Xavier for basically mind-raping her like its somehow no big deal. Also, the movie acts like this was all just another adventure and everything will continue on as normal as if we didn't just see at least 25 percent of the global population murdered by mutant terrorists in a single attack.
That's what comes to mind off the top of my head. To sum up, my feelings about the movie are basically
that the casting of the new characters was good to great, except Psylocke and Angel, and the Mystique/Storm storyline was surprisingly interesting and worked well, and pretty much every other aspect of the movie was mediocre to bad.