This was bound to happen as the various franchises of the MCU get fused, bringing the X-Men in along with rogue elements such as Deadpool by utilising the multiverse concept introduced in Doctor Strange. So real-life chums Reynolds and Jackman, both playing their unkillable hero characters, get to rib each other on screen for two hours while seeking to save the timeline in which the latter's death in Logan has sparked off the impending end of that reality.
This being essentially a third instalment of the Deadpool series, it means that no opportunity is passed by to play with breaking the fourth wall, the leads referring to each other's actual film careers, the studios bringing all of the MCU together and any other character in previous Marvel films. It's both campy fun on a meta level and very tiresome. There are glaringly obvious parallels with how Family Guy continually takes the piss out of Fox, its parent company, and you may put up with it out of goodwill towards the actors as well as the freshness of a superhero film just ridiculing the ludicrousness of all productions coming from the same stables, but this is also no way to go ahead in the longer term.
5/10