I saw it last night (my time) - I really liked, it I enjoyed it more than the first film. I thought the first 30 minutes was a bit slow but once the new characters were introduced it really picked up (a friend said they thought the first 30 minutes was the best part so each to their own)
There are lots of jokes in there about Marvel films, DC films and Marvel comics, some of these will go over most of the audiences head. The second post credit scene is really good, but it has been super hyped up.
It is probably ruder / more swearing and more violent than the first one - (just a warning if you were offended by the first one)
I thought there would be more people in the cinema than there was - maybe I just got a quiet session - movies don't normally open here on a Wednesday