Frankly I didn't like it.
There's a way to build tension, to make it seem like things are going someplace, while still leaving your characters behind the metaphorical 8-ball. And then there's kicking your characters in the teeth, over and over and over. And I don't like that. And Infinity War doesn't even do it particularly well.
This was always going to be a part one of two -- when the movies were originally announced, Avengers 4 was called Infinity War Part 2.
Multipart movies are always judged by the whole, and we have not seen the whole yet. Tune in this time next year for the (undoubtedly) thrilling conclusion.
