Most of the X-Men movies though were good and that was because of Wolverine. They knew who their best characters were and focused on them which was Wolverine, Professor X and Magneto and Mystique.
No, they'd have been good if the effort had been there for the other characters. The other X-Men characters are just as worth it when you put the effort in, look at all the great growth Cyclops himself underwent once the 90s effect wore off and writers who disliked Wolverine came onboard.
By your logic, the MCU shouldn't have bothered focusing on Captain America and Thor and the Guardians and just made Iron Man the star of every story.