I plan on seeing this again before I cement a rating on this movie, but I will say that I don't think this was peak MCU or one of my favorite Phase 4/5 offerings. My top 3 in post Endgame Marvel so far are GOTG3, NWH, and the very divisive L&T. NWH in particular spiritually is striving for what this one is one one hand, but I think NWH had more under the hood. I watched Deadpool 2 the other day, and this was more of the same as that movie essentially. But with a new coat of paint.
Hugh Jackman is great. I don't know how we can go back to PG13 Wolverine, lol! I get the feeling Hugh is just going to be MCU Wolverine now. They joke about him doing this until he is 90, but I think after this makes huge bank that's exactly the plan Feige and co have in mind. But Hugh gives this movie heart it desperately needs. Deadpool by the nature of his character throws out 100 jokes a second, and they have varying degrees of success. It's the Wolverine centric scenes that give this movie some emotional weight.
Cameos are fun. Cassandra Nova is awesome. Action in this one has cool looking sets, but Deadpool 2 definitely had better staged action set pieces.
In the end, first impression is 3.5/5. Maybe a 4 if you're seeing this in a crowded theater that is rabid for the cameos and such. It's a big, dumb Deadpool movie. The 3rd one we have gotten. By now, you know what this is and you're either there for it or not.