For the most part, it actually feels like there's 2 Ezra Miller on screen together. The VFX really do fall apart in the 3rd act. Like, I completely forgot that there wasn't 2 Ezra Miller IRL until some PS3-level frames in Act III. The 3rd Act undeniably, and with weak bait, tries to elicit feelings of nostalgia. Some of it makes quite no sense, though. I guess we can just say the F-word and constantly make sexual references to the shorthand "Richard" in PG-13 films, now. There's a bit too much nudity for nudity's sake. Man, the VFX in The Orb were really bad, but at least there I buy it as a 3rd-person experience through time. Some of the polished VFX were definitely top-of-the-genre. Did I mention that the ending make literally no sense? Some of the fight choreography was also top-notch, as in the Snyder realm. Some absolutely clear homages to Snyder shots. Some stuff was copied from MoS, but the redid the VFX (probably for the angles), and it's definitely worse-looking.
TL;DR: There's a lot to like, and also a lot to nitpick and/or outright scratch your head at.