It was okay. I liked the retcon(even though there are still continuity issues, hello future Wolverine's adamanitum claws), but I feel the movie itself was slow, kind of wasted the future stuff, and was seriously lacking in good character work. Plus, Wolverine felt like he was kind of useless in the past except for talking to a few people here and there. Also, I felt like it was more of the X3 Wolverine than the one in his last standalone movie. As a whole, I think First Class and The Wolverine are just straight up better made movies.
They show Stryker fishing Wolverine out of the river, remember?
Except Stryker is totally Mystique in that scene, there's a flash of yellow eyes.
I don't think this movie was perfect, but as a convoluted way of crossing over the First Class cast with the rest of the X Men movies and making the events of X3 never happen in any form? GREAT. That last scene just put a big grin on my face when I realized where they were going. They probably could've done more with the future stuff though. It was weird having what were major characters in the original trilogy occupy less than 20 minutes of screen time. James McAvoy and Michael Fassbender are still pretty good as young Professor X and Magneto though, and I guess you could say I'm looking forward to whatever Apocalypse nonsense ends up happening.
I imagine that after wolverine lost his adamantium claws in The Wolverine, when he joins with professor x and magneto, Magneto probably is able to rebond adamantium to Wolverine's claws.