A completely spoiler-free mini review of Endgame devoid of any comments about any plot points: It’s fun. You should rewatch Infinity War beforehand.
Further spoiler-free comments on the movie and the overall experience:
On reflection, after discussing with wife and friends, and contemplation...
I think this is a fascinating question, and was part of a broad conversation with friends after our Infinity War rewatch, where I was explaining why I didn't like IW on first viewing. Part of it was IW is not emotionally moving to me. But other friends find it affecting.
In contrast, going...