Have you seen Infinity War? If the answer is no, avoid this, or just leave after the actual plot concludes. The final scene to this will make absolutely zero sense if you avoided Infinity War, and it seems like this film references Captain America: Civil War more than it does the first Ant-Man movie. It’s a shame as the first Ant-Man movie was a lot of fun and is severely underrated when people talk about the MCU. This one feels important, but in a way where it’s not going to be known how important it is until the next film, which is a problem with Marvel films lately, they’re not self-contained so the endings are usually the equivalent of “Tune in next time”. You know what this reminds me of? When a massive video game has been released and a year later they release a few new levels as an expansion pack/DLC, it’s that. It doesn’t stand out on it’s own at all, it’s the Rosencrantz and Guildenstern Are Dead to Infinity War’s Hamlet (Or The Lion King 1 1/2 to The Lion King if you prefer). But the thing is; it doesn’t even do that that well. It would be good if it had a few subtle background references to it running throughout. But it doesn’t, it comes in at big points in the film, but not often enough. So it somehow fails at even that. Okay, “fails” is a very harsh word to use, because if it wasn’t for the Infinity War stuff, I would consider this a great film, it’s funny, looks fantastic, has INCREDIBLY inventive action set pieces, and the performances are good.
Now Marvel villains are either incredibly amazing (Thanos, Loki, Killmonger) or completely forgettable (that guy, the other one, the yellow one). This comes soooo close to being the first one. She has a tragic backstory which makes her sympathetic, her motives are logical but she’s also terrifying, and she’s not just “the good guy, but bad!” which seems to be the general template to make a villain in Marvel films. But she’s not used enough, and her ending is woefully unsatisfying and seems like it came because the writer needed to get home early so just wrote “and then MAGIC!”. It’s a shame as one thing this does very well is it gives a lot of the background characters moments to shine, even if a lot of their moments could be cut and nothing would be affected (particularly Bobby Cannavale and Judy Greer, which is a shame as I love both their characters, I just wish they had more to do). The star of the show is still Michael Pena though, who maintains one of the best side characters they’ve created, which of course means he’s probably going to be run into the ground through overuse in the next one, or killed.
So should you see this? I’d say yes, but not yet. Watch it as part of a MCU marathon, it lacks enough context to survive on its own.