Was disappointing only because there was SO much hype around it, and it ended up being a pretty decent Marvel opener, but nothing like their "big group" (Avengers, GoTG1-2, Winter Soldier, Ragnarok, Civil War). If Civil War and GoTG2 are at the very bottom edge of that range, then I'd put BP right under them, with other strong openers like First Avenger, Strange and Ant-Man. Certainly good, but I was expecting Ragnarok, and it just isn't. (Which is probably a bad expectation because an origin story is difficult to do that with.)
Some problems? As others have said, the CGI was just...not great. It was weird. Iron Man from a decade ago looked much better. As did Spider-Man recently, and I know many shots were full CGI in both. Clearly they don't have issues with full CGI. I was wondering if it had something to do with the suit being a single color and all black? The "uncanny" valley shit really seemed to pop out.
Other than that, the only issue is the same problem Thor has..Where stuff just seems so odd that I wanted to see more of it so they could explain it. Like Thor, with the advanced civilization using boats as combat aircraft--it's just so weird and silly that unless the rest of the movie is ALSO weird and silly (And the first Thor didn't play it that way), the very strange shit like is a sore thumb. Again, not because its bad, but just because its frustrating not having it explained. There is *a lot* of that in this film, even for a Comic book movie--but as said, exact same issue with Thor, which I guess is a side effect of having the entire origin be alien.
Any case, decent film. Solid B tier, as others have said. Not close to the ecstatic reviews its getting in some places, which are clearly agenda bullshit. But its a very entertaining, good film. Felt like I got my money's worth, and I won't mind buying it for the collection.