The title itself is something of one due to being one of several relaunched titles following Schism, and as well as being a best seller (during 2012, it was the highest selling Marvel ongoing title for the first half of the year), is largely considered one of the best moments in the 2000s period of X-Men comics.
Namor proved to be fairly popular during the run, primarily for being a Sex God who'd used his ability to do anyone to save the day, and struck up an Intergenerational Friendship with Hope.
Too Good to Last: Gillen's run was highly praised, especially for assembling one of the most powerful and badass X-line-ups of all time, the Exctinction Team. Sadly, it ended after only 20 issues, due to Executive Meddling.
