Marvel and relaunches go hand in hand, but they're rarely as ambitious as House of X. Writer Jonathan Hickman was given carte blanche to do whatever he wanted with the X-Men mythos and was able to create Marvel's hottest line of books in years. The X-Men books became the most exciting comics at the publisher, and a big reason for that was the way House of X and its sister book Powers of X took a big swing, knocking it out of the park.
Source:https://www.cbr.com/house-of-x-marvel-comics-need-reset/