Just saw it and here is my humble opinion:
This is a Marvel movie in Starwars paint. Like Fastfood unhealthy and not that good, but can be enjoyed from time to time, but nothing lasting remains. And every time they have touched a more meaningfull and serious topic for 5 seconds they instantly put on some action or humor that kills the mood.
So basicly: You don't miss anything when you don't see it, but you can enjoy it anyway. Just don't expect Starwars like it was.
Spoiler And I hate how all critics say it was different to TFA in that it didn't rely too much on the old movies: It did! It just used some scenes and dialogue 1:1 and added a change of characters or minor plottwist for the sake of having it changed. THAT IS NOT "DIFFERENT"! That is the "Anti-Same", and very familiar! Like ST Into Darkness chaning Spock/Kirk with the Kaaaahhhhn. Totaly different... For sure...
Also all the unresolved situations from the last movie are really resolved without any real resolution or consequences, making them totally meaningless, and actually devaluing TFA.