The X-Men are a much more powerful team than meets the eye. Marvel's merry mutants include the most powerful telepaths on Earth, Omega-class mutants who can control everything from cold to the Phoenix Force, super strong fighters, and a few immortals who are basically indestructible. The X-Men can hold their own against the most dangerous foes, but they aren't unstoppable. They've been rocked by their enemies many times.
Source:https://www.cbr.com/xmen-hero-villain-power-wishlist/