"Because I'm Marvel Jesus. Or Spock. Hard to say..."
So we have a rogue element of the TVA trying to recruit Wade to the MCU, while saying a fond farewell to the old Fox mutany universe- I loved that bit in the closing credits. The Big Bad (Emma Corfrin is great) Is Professor X's evil sister, and her goons are the likes of Pyro, Toad and Juggernaut. There's a hilarious appearance by Chris Evans, surely Captain America until he cries "flame on!" and an equally hilarious version of Gambit with Channing Tatum, pulling no punches at how ridiculous the character is.
And ahh, all those Deadpools. Love the unfortunate death of Nicepool, and yes... I did indeed notice the "Welshpool" visual joke.
Naturally we get hard-hitting, fourth wall breaking comments on the MCU, that Deadpool is not coming to the MCU at a good time, and his criticism of the Multiverse Saga. But there's far more than that. The 20th Century Fox logo is there in the void. Wesley Snipes' Blade gets to insist that "There's only ever been one Blade, and there's only ever gonna be one Blade", a delightful little comment on behind-the-scenes discord. Oh, and "Paul Rudd finally aged".
This film is, basically, not about the plot at all. It's just there to be hugely entertaining, and to throw cameos and in-jokes at us... and it works! I love the various alt Wolverines, from the comic book accurate short king to Patch to the Siege Perilous era crucified Wolverine. I love the Henry Cavill cameo and the little rib at DC. And of course Colossus loves The Great British Bake Off.
Basically, best Marvel film ever. And now I'm going to check out all the many Easter eggs I no doubt missed...