So, talking about cameos - somebody mentioned Bullseye (probably talking about the black guy close to Azazel, that we've seen in the trailers?), but I'm not really sure that's him.
Also, the Russian from Punisher 2004? I think it's safe to say that the guy in red/white striped t-shirt is him? The thing that bothered me a bit is they didn't get original actors for all those mutants/cameos in Cassandra's lair, especially having in mind they got big names like Evans, Garner, Snipes, Tatum back for their roles. Was it really hard to manage that? I could be wrong, but I don't think it would affect the budget of the film so much, most of those cameos are non-speaking (yeah, I know that Vinnie Jones told that he would never wear that body suit from Last Stand again)...But yeah, although this is nitpicking (and there are much more important things that I didn't like in this movie), it bothered me, not just because they are not played by original actors, but some of those mutants/cameos looked like some cheap cosplay versions of originals, especially Psylocke - who I'd never notice until she pulled out the purple whip. Also, Blob - I've noticed the big fat guy, but I'd never guess that's Blob until I saw the credits. I liked that they at least mentioned some unexpected names like Daredevil and Punisher though, especially liked the joke about the Punisher ("which one? there's like 5 of them!"). Those who I definitely didn't expect to see in this movie, which really blew me away, especially that they weren't just simple cameos - Johnny Storm and freaking Blade - Blade looked so good!
Regarding the movie itself, it's still early to give my final verdict, partially because all those cameos/references/fan service stuff were really overwhelming and bombarded my senses in a way, but for now it is somewhere around 7.5/10...First Deadpool is still the best in my book, it was something fresh and original for that time and was the most grounded of all DP movies. This one was better then DP2 but was definitely the silliest of the trilogy, which bothered me a bit, especially because there is Wolverine in it - yeah I know this is basically DP3 and it's his movie, but it was just way too silly for me to be emotionally invested in it and to "buy" the Wolverine's tragic story and his character development. It has mostly to do with 2 things - Ryan's/DP's humor and jokes became hit & miss for me, maybe it's because I'm older, but I found many of them to be stale, somehow distracting, even annoying at times - I just wished he would shut up for once and let me "rest" a bit (maybe they wanted us to feel what poor Wolverine felt for the whole movie). I just think they should have toned it down at least a bit, and be a little bit more serious so we could feel the emotional impact and stakes of the movie, at least because of Wolverine. Second thing - "lazy writing" like "oh, how should we end the movie and what should be the climax? I know, let's put the Deadpool Corps out of nowhere because the fans will surely love them, and then how they should beat them? I know, let's end the final fight by bringing Peterpool!". And one more thing regarding main villains - Cassandra/Paradox never felt like such a big threat and I didn't fully get their motivation, but maybe that's just me.
Anyway, just my 2 cents after the first viewing, my opinion about the movie will probably be a bit more clear after the second viewing, when the movie arrives on digital and there's no more hype about it like now.
By the way, I've noticed people on forum noting that you don't have to have existing knowledge about MCU/Foxverse to fully enjoy this movie. I beg to differ - out of all DP movies, I feel this one is really meant for hardcore fans and a casual movie goer wouldn't enjoy it nearly as much, because he/she wouldn't understand half of jokes and most of the cameos wouldn't mean anything to them. And although I enjoyed it, I would never recommend it to casual movie goer.