First of all: This is a 15 certificate movie and thoroughly deserves it! There is a lot of bad swearing and nasty, explicit, close-up violence.
BUT if you have appreciated some of the previous X-Men movies then you will not want to miss this one – which follows several themes from the first movie incarnations (before the recent alternative-timeline ‘reboot’ with new Xavier and Magneto actors), and brings them to a satisfying closure.
And the reason I write about it here is that there is a strong implicit theme of repentance and redemption in several character arcs; and several explicit and positive Christian references – at the beginning, middle and end.
(This may – perhaps? – have something to do with the fact that the lead actor – Hugh Jackman – is apparently publicly a Christian, from an evangelical home.)